diff --git a/server/internal/model/database_info.go b/server/internal/model/database_info.go
index c614237..e2eea7b 100644
--- a/server/internal/model/database_info.go
+++ b/server/internal/model/database_info.go
@@ -54,21 +54,22 @@ type CreateDatabaseRequest struct {
 
 // UpdateRequest 更新数据库信息请求
 type UpdateDatabaseRequest struct {
-	Name                 string `json:"name"`
-	Description          string `json:"description"`
-	DBType               string `json:"db_type"`
-	Host                 string `json:"host"`
-	Port                 int    `json:"port"`
-	Username             string `json:"username"`
-	Password             string `json:"password"`
-	Database             string `json:"database"`
-	TableCount           int    `json:"table_count"`
-	Charset              string `json:"charset"`
-	SSLMode              string `json:"ssl_mode"`
-	URI                  string `json:"uri"` // Neo4j 连接地址
-	GraphLabels          string `json:"graph_labels"`          // Neo4j 标签列表 (JSON)
-	GraphRelationship    string `json:"graph_relationship"`  // Neo4j 关系类型列表 (JSON)
-	SelectedLabel        string `json:"selected_label"`       // 当前选中的标签
+	Name                 string                  `json:"name"`
+	Description          string                  `json:"description"`
+	DBType               string                  `json:"db_type"`
+	Host                 string                  `json:"host"`
+	Port                 int                     `json:"port"`
+	Username             string                  `json:"username"`
+	Password             string                  `json:"password"`
+	Database             string                  `json:"database"`
+	TableCount           int                     `json:"table_count"`
+	Charset              string                  `json:"charset"`
+	SSLMode              string                  `json:"ssl_mode"`
+	URI                  string                  `json:"uri"` // Neo4j 连接地址
+	GraphLabels          string                  `json:"graph_labels"`          // Neo4j 标签列表 (JSON)
+	GraphRelationship    string                  `json:"graph_relationship"`  // Neo4j 关系类型列表 (JSON)
+	SelectedLabel        string                  `json:"selected_label"`       // 当前选中的标签
+	SubTables           []CreateSubTableRequest `json:"sub_tables"` // 子表配置
 }
 
 // SaveGraphRequest 保存图谱信息请求
diff --git a/server/internal/model/sub_table_info.go b/server/internal/model/sub_table_info.go
index c4eb1c7..f841423 100644
--- a/server/internal/model/sub_table_info.go
+++ b/server/internal/model/sub_table_info.go
@@ -95,6 +95,7 @@ type CreateSubTableRequest struct {
 	RelationField   string          `json:"relation_field"`
 	RelationType    string          `json:"relation_type"`
 	Fields          []FieldMapping  `json:"fields"` // 字段映射列表
+	DDL            string          `json:"ddl"`   // 建表DDL
 }
 
 // UpdateSubTableRequest 更新子表请求
@@ -105,6 +106,7 @@ type UpdateSubTableRequest struct {
 	MappingType     string `json:"mapping_type"`
 	RelationField   string `json:"relation_field"`
 	RelationType    string `json:"relation_type"`
+	DDL            string `json:"ddl"`
 }
 
 // SubTableMapping 完整的子表映射配置（存储到文件的格式）
diff --git a/server/internal/service/database_service.go b/server/internal/service/database_service.go
index aa4a390..89893d2 100644
--- a/server/internal/service/database_service.go
+++ b/server/internal/service/database_service.go
@@ -696,12 +696,66 @@ func (s *DatabaseService) Update(id string, req model.UpdateDatabaseRequest) (*m
 		updates["ssl_mode"] = req.SSLMode
 	}
 
+	// 更新数据库基本信息
 	info := &model.DatabaseInfo{}
 	if err := s.repo.Update(id, info); err != nil {
 		log.Printf("[Update] 更新失败: %v", err)
 		return nil, err
 	}
 
+	// 处理 SubTables - 创建或更新子表记录（包括 DDL）
+	if len(req.SubTables) > 0 {
+		log.Printf("[Update] 处理 %d 个子表配置", len(req.SubTables))
+		for _, subTableReq := range req.SubTables {
+			subTableReq.DatabaseID = id
+			// 检查是否已存在（根据 parent_table 查找）
+			existingTables, err := s.subTableRepo.FindByDatabaseID(id)
+			if err != nil {
+				log.Printf("[Update] 查询子表失败: %v", err)
+				continue
+			}
+			found := false
+			for _, existing := range existingTables {
+				if existing.ParentTable == subTableReq.ParentTable {
+					// 存在则更新
+					log.Printf("[Update] 更新子表: %s", existing.ID)
+					err := s.subTableRepo.Update(existing.ID, &model.SubTableInfo{
+						ParentTable:     subTableReq.ParentTable,
+						SubTableName:    subTableReq.SubTableName,
+						SubTableComment: subTableReq.SubTableComment,
+						MappingType:     subTableReq.MappingType,
+						RelationField:   subTableReq.RelationField,
+						RelationType:    subTableReq.RelationType,
+						DDL:             subTableReq.DDL,
+					})
+					if err != nil {
+						log.Printf("[Update] 更新子表失败: %v", err)
+					}
+					found = true
+					break
+				}
+			}
+			if !found {
+				// 不存在则创建
+				log.Printf("[Update] 创建子表: %s", subTableReq.ParentTable)
+				err := s.subTableRepo.Create(&model.SubTableInfo{
+					ID:              uuid.New().String(),
+					DatabaseID:      id,
+					ParentTable:     subTableReq.ParentTable,
+					SubTableName:    subTableReq.SubTableName,
+					SubTableComment: subTableReq.SubTableComment,
+					MappingType:     subTableReq.MappingType,
+					RelationField:   subTableReq.RelationField,
+					RelationType:    subTableReq.RelationType,
+					DDL:             subTableReq.DDL,
+				})
+				if err != nil {
+					log.Printf("[Update] 创建子表失败: %v", err)
+				}
+			}
+		}
+	}
+
 	return s.repo.FindByID(id)
 }
 
diff --git a/server/internal/service/sub_table_service.go b/server/internal/service/sub_table_service.go
index c791528..42c78ef 100644
--- a/server/internal/service/sub_table_service.go
+++ b/server/internal/service/sub_table_service.go
@@ -119,6 +119,7 @@ func (s *SubTableService) Create(req model.CreateSubTableRequest) (*model.SubTab
 		MappingType:     req.MappingType,
 		RelationField:   req.RelationField,
 		RelationType:    req.RelationType,
+		DDL:            req.DDL,
 	}
 
 	if err := s.repo.Create(info); err != nil {
@@ -196,6 +197,8 @@ func (s *SubTableService) Update(id string, req model.UpdateSubTableRequest) (*m
 	if req.RelationType != "" {
 		info.RelationType = req.RelationType
 	}
+	// 更新 DDL
+	info.DDL = req.DDL
 
 	if err := s.repo.Update(id, info); err != nil {
 		log.Printf("[SubTable Update] 更新失败: %v", err)