diff --git a/backend/internal/router/admin/versions.go b/backend/internal/router/admin/versions.go
index 81f173b..121c4df 100644
--- a/backend/internal/router/admin/versions.go
+++ b/backend/internal/router/admin/versions.go
@@ -542,6 +542,87 @@ func handleUpdateVersionGlobal(c *gin.Context) {
 		updates["changelog"] = req.Changelog
 	}
 
+	// 验证 BaseVersionID 不能是自身
+	if req.BaseVersionID != nil && *req.BaseVersionID == version.ID {
+		response.Error(c, 400, "基础版本不能选择自身")
+		return
+	}
+
+	// 处理 UpdateType 变化时的全量包更新
+	newUpdateType := req.UpdateType
+	if newUpdateType == "" {
+		newUpdateType = version.UpdateType
+	}
+
+	// 如果 UpdateType 从 full 改为 patch，需要重新生成全量包
+	if version.UpdateType == "full" && newUpdateType == "patch" {
+		// 需要有 BaseVersionID
+		baseVersionID := req.BaseVersionID
+		if baseVersionID == nil {
+			baseVersionID = version.BaseVersionID
+		}
+		if baseVersionID == nil {
+			response.Error(c, 400, "补丁包必须指定基础版本")
+			return
+		}
+
+		var baseVersion model.Version
+		if err := database.DB.First(&baseVersion, *baseVersionID).Error; err != nil {
+			response.Error(c, 400, "基础版本不存在")
+			return
+		}
+
+		baseFullPackagePath := baseVersion.FullPackagePath
+		if baseFullPackagePath == "" {
+			baseFullPackagePath = baseVersion.FilePath
+		}
+
+		// 使用当前 FilePath 作为补丁包
+		patchPath := req.FilePath
+		if patchPath == "" {
+			patchPath = version.FilePath
+		}
+
+		fullPkgPath, fullPkgSize, fullPkgHash, err := MergePatchWithFullPackage(
+			baseFullPackagePath,
+			patchPath,
+			version.ApplicationID,
+		)
+		if err != nil {
+			log.Printf("[ERROR] Failed to merge patch with full package: %v\n", err)
+			response.Error(c, 500, "合并补丁包失败: "+err.Error())
+			return
+		}
+
+		updates["base_version_id"] = baseVersionID
+		updates["full_package_path"] = fullPkgPath
+		updates["full_package_size"] = fullPkgSize
+		updates["full_package_hash"] = fullPkgHash
+		log.Printf("[INFO] Regenerated full package for patch type change: %s, size: %d\n", fullPkgPath, fullPkgSize)
+	}
+
+	// 如果 UpdateType 从 patch 改为 full，全量包就是 FilePath 本身
+	if version.UpdateType == "patch" && newUpdateType == "full" {
+		filePath := req.FilePath
+		if filePath == "" {
+			filePath = version.FilePath
+		}
+		fileSize := req.FileSize
+		if fileSize == 0 {
+			fileSize = version.FileSize
+		}
+		fileHash := req.FileHash
+		if fileHash == "" {
+			fileHash = version.FileHash
+		}
+
+		updates["full_package_path"] = filePath
+		updates["full_package_size"] = fileSize
+		updates["full_package_hash"] = fileHash
+		updates["base_version_id"] = nil
+		log.Printf("[INFO] Set full package to file itself for full type change: %s\n", filePath)
+	}
+
 	log.Printf("[DEBUG] Updates map: %+v\n", updates)
 
 	// 如果文件被更新，删除旧文件