diff --git a/backend/app/api/v1/__init__.py b/backend/app/api/v1/__init__.py
index c41ec91..ecb1107 100644
--- a/backend/app/api/v1/__init__.py
+++ b/backend/app/api/v1/__init__.py
@@ -10,9 +10,11 @@ api_router = APIRouter()
 
 # Include sub-routers
 api_router.include_router(projects.router, prefix="/projects", tags=["projects"])
-api_router.include_router(files.router, prefix="/files", tags=["files"])
-api_router.include_router(chunks.router, prefix="/chunks", tags=["chunks"])
-api_router.include_router(questions.router, prefix="/questions", tags=["questions"])
-api_router.include_router(datasets.router, prefix="/datasets", tags=["datasets"])
-api_router.include_router(eval.router, prefix="/eval", tags=["eval"])
+# files, chunks, questions, datasets, eval 需要嵌套在 projects 下
+# 通过 projects 路由中的子路由处理
+api_router.include_router(files.router, prefix="/projects/{project_id}/files", tags=["files"])
+api_router.include_router(chunks.router, prefix="/projects/{project_id}/chunks", tags=["chunks"])
+api_router.include_router(questions.router, prefix="/projects/{project_id}/questions", tags=["questions"])
+api_router.include_router(datasets.router, prefix="/projects/{project_id}/datasets", tags=["datasets"])
+api_router.include_router(eval.router, prefix="/projects/{project_id}/eval", tags=["eval"])
 api_router.include_router(models.router, prefix="/models", tags=["models"])
diff --git a/backend/app/api/v1/chunks/__init__.py b/backend/app/api/v1/chunks/__init__.py
index 04ed245..590a084 100644
--- a/backend/app/api/v1/chunks/__init__.py
+++ b/backend/app/api/v1/chunks/__init__.py
@@ -2,6 +2,7 @@
 Chunks API Router
 """
 import asyncio
+from pathlib import Path
 from typing import List, Optional
 from uuid import UUID
 from pydantic import BaseModel, Field
@@ -13,19 +14,28 @@ from app.api.response import ApiResponse, PaginatedResponse
 from app.core.database import get_db
 from app.core.exceptions import NotFoundException
 from app.core.crud import CRUDBase
+from app.core.logging import log_success, log_failure
 from app.models.models import Chunk, File
 from app.schemas.chunk import ChunkResponse
 from app.schemas.chunk import ChunkCreateSchema
 from app.services.text_splitter.splitter import get_splitter
-from app.services.file_processor.pdf_processor import process_pdf
-from app.services.file_processor.docx_processor import process_docx
-from app.services.file_processor.excel_processor import process_csv, process_excel
+from markitdown import MarkItDown
 
 router = APIRouter()
 
 # Initialize CRUD
 chunk_crud = CRUDBase(Chunk)
 
+# Initialize markitdown
+markitdown = MarkItDown()
+
+
+def get_project_ready_dir(project_id: str) -> Path:
+    """获取项目的 ready 文件目录"""
+    base_dir = Path("/data/code/YG-Datasets/data") / project_id / "ready"
+    base_dir.mkdir(parents=True, exist_ok=True)
+    return base_dir
+
 
 class SplitRequest(BaseModel):
     """Request model for splitting text"""
@@ -37,28 +47,29 @@ class SplitRequest(BaseModel):
 
 
 async def process_file_by_type(file: File) -> str:
-    """Process file based on its type"""
+    """Process file based on its type, convert to markdown"""
     if not file.file_path:
         raise NotFoundException("File", file.id)
 
-    processors = {
-        "pdf": process_pdf,
-        "docx": process_docx,
-        "xlsx": process_excel,
-        "csv": process_csv,
-    }
+    # Supported types for markitdown
+    markitdown_types = ["pdf", "docx", "doc", "pptx", "ppt", "xlsx", "xls", "htm", "html"]
 
-    processor = processors.get(file.file_type)
-    if not processor:
-        # Return raw text for txt, md files
+    if file.file_type in markitdown_types:
+        # Use markitdown to convert to markdown
         loop = asyncio.get_event_loop()
-        content = await loop.run_in_executor(
+        result = await loop.run_in_executor(
             None,
-            lambda: open(file.file_path, 'r', encoding='utf-8').read()
+            lambda: markitdown.convert(file.file_path)
         )
-        return content
+        return result.text_content
 
-    return await processor(file.file_path)
+    # Return raw text for txt, md files
+    loop = asyncio.get_event_loop()
+    content = await loop.run_in_executor(
+        None,
+        lambda: open(file.file_path, 'r', encoding='utf-8').read()
+    )
+    return content
 
 
 @router.post("/split", response_model=ApiResponse)
@@ -68,52 +79,97 @@ async def split_text(
     db: AsyncSession = Depends(get_db)
 ):
     """Split text into chunks"""
-    # Get file
-    result = await db.execute(
-        select(File).where(File.id == request.file_id, File.project_id == project_id)
-    )
-    file = result.scalar_one_or_none()
-    if not file:
-        raise NotFoundException("File", request.file_id)
-
-    # Process file
-    text = await process_file_by_type(file)
-
-    # Update file status
-    file.status = "processing"
-    await db.commit()
-
-    # Split text
-    kwargs = {"chunk_size": request.chunk_size, "overlap": request.overlap}
-    if request.method == "custom" and request.separator:
-        kwargs["separator"] = request.separator
-
-    splitter = get_splitter(request.method, **kwargs)
-    split_results = splitter.split(text)
-
-    # Save chunks
-    chunks = []
-    for chunk_data in split_results:
-        db_chunk = Chunk(
-            project_id=project_id,
-            file_id=file.id,
-            name=chunk_data.get("name", f"Chunk {chunk_data['index'] + 1}"),
-            content=chunk_data["content"],
-            word_count=chunk_data.get("word_count", len(chunk_data["content"].split()))
+    try:
+        # Get file
+        result = await db.execute(
+            select(File).where(File.id == request.file_id, File.project_id == project_id)
         )
-        db.add(db_chunk)
-        chunks.append(db_chunk)
+        file = result.scalar_one_or_none()
+        if not file:
+            raise NotFoundException("File", request.file_id)
 
-    await db.commit()
+        # 记录开始处理
+        log_success(
+            "开始处理文件",
+            project_id=str(project_id),
+            file_id=str(file.id),
+            filename=file.filename,
+            method=request.method,
+            chunk_size=request.chunk_size,
+            overlap=request.overlap
+        )
 
-    # Update file status
-    file.status = "completed"
-    await db.commit()
+        # Process file
+        text = await process_file_by_type(file)
 
-    return ApiResponse.ok(
-        data={"chunks": len(chunks)},
-        message=f"Successfully split into {len(chunks)} chunks"
-    )
+        # Update file status
+        file.status = "processing"
+        await db.commit()
+
+        # Split text
+        kwargs = {"chunk_size": request.chunk_size, "overlap": request.overlap}
+        if request.method == "custom" and request.separator:
+            kwargs["separator"] = request.separator
+
+        splitter = get_splitter(request.method, **kwargs)
+        split_results = splitter.split(text)
+
+        # Save chunks
+        chunks = []
+        for chunk_data in split_results:
+            db_chunk = Chunk(
+                project_id=project_id,
+                file_id=file.id,
+                name=chunk_data.get("name", f"Chunk {chunk_data['index'] + 1}"),
+                content=chunk_data["content"],
+                word_count=chunk_data.get("word_count", len(chunk_data["content"].split()))
+            )
+            db.add(db_chunk)
+            chunks.append(db_chunk)
+
+        await db.commit()
+
+        # Save processed markdown to ready directory
+        ready_dir = get_project_ready_dir(str(project_id))
+        md_filename = f"{file.id}_{file.filename}.md"
+        md_path = ready_dir / md_filename
+
+        # Write markdown content to file
+        loop = asyncio.get_event_loop()
+        await loop.run_in_executor(
+            None,
+            lambda: md_path.write_text(text, encoding='utf-8')
+        )
+
+        # Update file path to ready location
+        file.file_path = str(md_path)
+        file.status = "completed"
+        await db.commit()
+
+        # 记录成功日志
+        log_success(
+            "文件处理完成",
+            project_id=str(project_id),
+            file_id=str(file.id),
+            filename=file.filename,
+            chunk_count=len(chunks),
+            text_length=len(text),
+            ready_path=str(md_path)
+        )
+
+        return ApiResponse.ok(
+            data={"chunks": len(chunks)},
+            message=f"Successfully split into {len(chunks)} chunks"
+        )
+    except Exception as e:
+        # 记录失败日志
+        log_failure(
+            "文件处理失败",
+            project_id=str(project_id),
+            file_id=str(request.file_id),
+            error=str(e)
+        )
+        raise
 
 
 @router.get("", response_model=ApiResponse)
diff --git a/backend/app/api/v1/files/__init__.py b/backend/app/api/v1/files/__init__.py
index ccf46c7..15de0d6 100644
--- a/backend/app/api/v1/files/__init__.py
+++ b/backend/app/api/v1/files/__init__.py
@@ -5,7 +5,7 @@ import os
 import asyncio
 from pathlib import Path
 from typing import Optional
-from uuid import UUID
+from uuid import UUID, uuid4
 from fastapi import APIRouter, Depends, UploadFile, File, Query
 from fastapi.responses import FileResponse
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -15,20 +15,31 @@ from app.core.config import get_settings
 from app.core.database import get_db
 from app.core.exceptions import ValidationException, NotFoundException
 from app.core.crud import CRUDBase
+from app.core.logging import log_success, log_failure
 from app.models.models import File as FileModel
 from app.schemas.file import FileResponse, FileCreateSchema
 
 settings = get_settings()
 router = APIRouter()
 
-# Ensure upload directory exists
-UPLOAD_DIR = Path(settings.UPLOAD_DIR)
-UPLOAD_DIR.mkdir(parents=True, exist_ok=True)
-
 # Initialize CRUD
 file_crud = CRUDBase(FileModel)
 
 
+def get_project_raw_dir(project_id: str) -> Path:
+    """获取项目的 raw 文件目录"""
+    base_dir = Path("/data/code/YG-Datasets/data") / project_id / "raw"
+    base_dir.mkdir(parents=True, exist_ok=True)
+    return base_dir
+
+
+def get_project_ready_dir(project_id: str) -> Path:
+    """获取项目的 ready 文件目录（处理后的文件）"""
+    base_dir = Path("/data/code/YG-Datasets/data") / project_id / "ready"
+    base_dir.mkdir(parents=True, exist_ok=True)
+    return base_dir
+
+
 def get_file_type(filename: str) -> str:
     """Get file type from extension"""
     ext = filename.rsplit('.', 1)[-1].lower() if '.' in filename else ''
@@ -82,40 +93,62 @@ async def upload_file(
     db: AsyncSession = Depends(get_db)
 ):
     """Upload a file"""
-    # Read file content for validation
-    content = await file.read()
-    file_size = len(content)
+    try:
+        # Read file content for validation
+        content = await file.read()
+        file_size = len(content)
 
-    # Validate file
-    validate_file(file.filename, file_size)
+        # Validate file
+        validate_file(file.filename, file_size)
 
-    # Save file to disk
-    safe_filename = f"{project_id}_{UUID.uuid4().hex[:8]}_{file.filename}"
-    file_path = UPLOAD_DIR / safe_filename
+        # Save file to disk - 使用项目 raw 目录
+        safe_filename = f"{uuid4().hex[:8]}_{file.filename}"
+        project_dir = get_project_raw_dir(str(project_id))
+        file_path = project_dir / safe_filename
 
-    # Write file asynchronously
-    await asyncio.get_event_loop().run_in_executor(
-        None,
-        lambda: file_path.write_bytes(content)
-    )
+        # Write file asynchronously
+        await asyncio.get_event_loop().run_in_executor(
+            None,
+            lambda: file_path.write_bytes(content)
+        )
 
-    # Create file record
-    db_file = FileModel(
-        project_id=project_id,
-        filename=file.filename,
-        file_type=get_file_type(file.filename),
-        file_path=str(file_path),
-        size=file_size,
-        status="pending"
-    )
-    db.add(db_file)
-    await db.commit()
-    await db.refresh(db_file)
+        # Create file record
+        db_file = FileModel(
+            project_id=project_id,
+            filename=file.filename,
+            file_type=get_file_type(file.filename),
+            file_path=str(file_path),
+            size=file_size,
+            status="pending"
+        )
+        db.add(db_file)
+        await db.commit()
+        await db.refresh(db_file)
 
-    return ApiResponse.ok(
-        data={"id": str(db_file.id), "filename": db_file.filename, "status": db_file.status},
-        message="File uploaded successfully"
-    )
+        # 记录成功日志
+        log_success(
+            "文件上传成功",
+            project_id=str(project_id),
+            file_id=str(db_file.id),
+            filename=file.filename,
+            file_type=db_file.file_type,
+            file_size=file_size,
+            file_path=str(file_path)
+        )
+
+        return ApiResponse.ok(
+            data={"id": str(db_file.id), "filename": db_file.filename, "status": db_file.status},
+            message="File uploaded successfully"
+        )
+    except Exception as e:
+        # 记录失败日志
+        log_failure(
+            "文件上传失败",
+            project_id=str(project_id),
+            filename=file.filename if 'file' in locals() else "unknown",
+            error=str(e)
+        )
+        raise
 
 
 @router.get("", response_model=ApiResponse)
diff --git a/backend/app/core/logging.py b/backend/app/core/logging.py
index f4e737e..89362a8 100644
--- a/backend/app/core/logging.py
+++ b/backend/app/core/logging.py
@@ -4,8 +4,9 @@ Logging Configuration
 """
 import logging
 import sys
+from datetime import datetime
 from typing import Any
-from logging.handlers import RotatingFileHandler
+from logging.handlers import RotatingFileHandler, TimedRotatingFileHandler
 from pathlib import Path
 from app.core.config import get_settings
 
@@ -15,6 +16,18 @@ settings = get_settings()
 LOG_DIR = Path("./logs")
 LOG_DIR.mkdir(exist_ok=True)
 
+# 日期格式
+LOG_DATE = datetime.now().strftime("%Y-%m-%d")
+
+# 当天的日志目录
+CURRENT_LOG_DIR = LOG_DIR / LOG_DATE
+CURRENT_LOG_DIR.mkdir(exist_ok=True)
+
+
+def get_log_path(filename: str) -> Path:
+    """获取当天的日志文件路径"""
+    return CURRENT_LOG_DIR / filename
+
 
 def setup_logging(name: str = "yg_dataset") -> logging.Logger:
     """Setup application logging"""
@@ -35,20 +48,21 @@ def setup_logging(name: str = "yg_dataset") -> logging.Logger:
     console_handler.setFormatter(console_formatter)
     logger.addHandler(console_handler)
 
-    # File handler
-    file_handler = RotatingFileHandler(
-        LOG_DIR / f"{name}.log",
-        maxBytes=10 * 1024 * 1024,  # 10MB
-        backupCount=5,
+    # Main log file handler - app.log
+    main_file_handler = TimedRotatingFileHandler(
+        get_log_path("app.log"),
+        when="midnight",
+        interval=1,
+        backupCount=30,
         encoding="utf-8"
     )
-    file_handler.setLevel(logging.INFO)
-    file_formatter = logging.Formatter(
+    main_file_handler.setLevel(logging.INFO)
+    main_file_formatter = logging.Formatter(
         fmt="%(asctime)s | %(levelname)-8s | %(name)s:%(funcName)s:%(lineno)d | %(message)s",
         datefmt="%Y-%m-%d %H:%M:%S"
     )
-    file_handler.setFormatter(file_formatter)
-    logger.addHandler(file_handler)
+    main_file_handler.setFormatter(main_file_formatter)
+    logger.addHandler(main_file_handler)
 
     return logger
 
@@ -57,6 +71,65 @@ def setup_logging(name: str = "yg_dataset") -> logging.Logger:
 logger = setup_logging()
 
 
+# ============== Success Logger ==============
+def get_success_logger() -> logging.Logger:
+    """获取成功日志记录器"""
+    success_logger = logging.getLogger("yg_dataset.success")
+    if not success_logger.handlers:
+        handler = RotatingFileHandler(
+            get_log_path("success.log"),
+            maxBytes=10 * 1024 * 1024,
+            backupCount=30,
+            encoding="utf-8"
+        )
+        handler.setLevel(logging.INFO)
+        formatter = logging.Formatter(
+            fmt="%(asctime)s | %(message)s",
+            datefmt="%Y-%m-%d %H:%M:%S"
+        )
+        handler.setFormatter(formatter)
+        success_logger.addHandler(handler)
+        success_logger.setLevel(logging.INFO)
+    return success_logger
+
+
+# ============== Failure Logger ==============
+def get_failure_logger() -> logging.Logger:
+    """获取失败日志记录器"""
+    failure_logger = logging.getLogger("yg_dataset.failure")
+    if not failure_logger.handlers:
+        handler = RotatingFileHandler(
+            get_log_path("failure.log"),
+            maxBytes=10 * 1024 * 1024,
+            backupCount=30,
+            encoding="utf-8"
+        )
+        handler.setLevel(logging.WARNING)
+        formatter = logging.Formatter(
+            fmt="%(asctime)s | %(levelname)-8s | %(name)s:%(funcName)s:%(lineno)d | %(message)s",
+            datefmt="%Y-%m-%d %H:%M:%S"
+        )
+        handler.setFormatter(formatter)
+        failure_logger.addHandler(handler)
+        failure_logger.setLevel(logging.WARNING)
+    return failure_logger
+
+
+# ============== Convenience functions ==============
+def log_success(message: str, **kwargs):
+    """记录成功日志"""
+    extra_info = " | ".join([f"{k}={v}" for k, v in kwargs.items()]) if kwargs else ""
+    full_message = f"{message} | {extra_info}" if extra_info else message
+    get_success_logger().info(full_message)
+
+
+def log_failure(message: str, **kwargs):
+    """记录失败日志"""
+    extra_info = " | ".join([f"{k}={v}" for k, v in kwargs.items()]) if kwargs else ""
+    full_message = f"{message} | {extra_info}" if extra_info else message
+    get_failure_logger().warning(full_message)
+
+
 class LoggerMixin:
     """Mixin to add logging capability to classes"""
 
diff --git a/backend/app/main.py b/backend/app/main.py
index 7310ba7..e3f2cf1 100644
--- a/backend/app/main.py
+++ b/backend/app/main.py
@@ -107,7 +107,7 @@ async def app_exception_handler(request: Request, exc: AppException):
         content=ApiResponse.fail(
             message=exc.message,
             error={"code": exc.code, "details": exc.details}
-        ).model_dump()
+        ).model_dump(mode='json')
     )
 
 
@@ -127,7 +127,7 @@ async def validation_exception_handler(request: Request, exc: RequestValidationE
         content=ApiResponse.fail(
             message="Validation error",
             error={"code": "VALIDATION_ERROR", "details": {"errors": errors}}
-        ).model_dump()
+        ).model_dump(mode='json')
     )
 
 
@@ -140,7 +140,7 @@ async def database_exception_handler(request: Request, exc: SQLAlchemyError):
         content=ApiResponse.fail(
             message="Database operation failed",
             error={"code": "DATABASE_ERROR"}
-        ).model_dump()
+        ).model_dump(mode='json')
     )
 
 
@@ -153,7 +153,7 @@ async def general_exception_handler(request: Request, exc: Exception):
         content=ApiResponse.fail(
             message="Internal server error",
             error={"code": "INTERNAL_ERROR"}
-        ).model_dump()
+        ).model_dump(mode='json')
     )