diff --git a/db/db.go b/db/db.go
index 0b9ee4c..0ebc620 100644
--- a/db/db.go
+++ b/db/db.go
@@ -69,14 +69,33 @@ func (c *client) init() {
 		log.Infof("set default log level")
 		c.SetSetting(SettingLogLevel, "info")
 	}
-	// if tr := c.GetAllDonloadClients(); len(tr) == 0 {
-	// 	log.Warnf("no download client, set default download client")
-	// 	c.SaveDownloader(&ent.DownloadClients{
-	// 		Name:           "transmission",
-	// 		Implementation: downloadclients.ImplementationTransmission,
-	// 		URL:            "http://transmission:9091",
-	// 	})
-	// }
+	c.initBuildinClient()
+}
+
+func (c *client) initBuildinClient() {
+	hasBuildin := false
+	tr := c.GetAllDonloadClients()
+	for _, d := range tr {
+		if d.Implementation == downloadclients.ImplementationBuildin {
+			hasBuildin = true
+			break
+		}
+	}
+	if !hasBuildin {
+		log.Warnf("no buildin download client, set default download client")
+		if err := c.SaveDownloader(&ent.DownloadClients{
+			Enable:                   true,
+			Name:                     "内建下载器",
+			Implementation:           downloadclients.ImplementationBuildin,
+			URL:                      "buildin",
+			Priority1:                50,
+			RemoveCompletedDownloads: true,
+			RemoveFailedDownloads:    true,
+		}); err != nil {
+			log.Warnf("add buildin client error: %v", err)
+		}
+	}
+
 }
 
 func (c *client) generateJwtSerectIfNotExist() {
@@ -323,26 +342,13 @@ func (c *client) GetAllDonloadClients() []*ent.DownloadClients {
 	cc, err := c.ent.DownloadClients.Query().Order(ent.Asc(downloadclients.FieldPriority1)).All(context.TODO())
 	if err != nil {
 		log.Errorf("no download client")
-		return []*ent.DownloadClients{
-			{
-				Implementation: downloadclients.ImplementationBuildin,
-				Name:           "内建下载器",
-				Priority1:      9999,
-				Enable:         true,
-			},
-		}
+		return nil
 	}
-	cc = append(cc, &ent.DownloadClients{
-		Implementation: downloadclients.ImplementationBuildin,
-		Name:           "内建下载器",
-		Priority1:      9999,
-		Enable:         true,
-	})
 	return cc
 }
 
-func (c *client) DeleteDownloadCLient(id int) {
-	c.ent.DownloadClients.Delete().Where(downloadclients.ID(id)).Exec(context.TODO())
+func (c *client) DeleteDownloadCLient(id int) { //not delete buildin client
+	c.ent.DownloadClients.Delete().Where(downloadclients.ID(id), downloadclients.ImplementationNEQ(downloadclients.ImplementationBuildin)).Exec(context.TODO())
 }
 
 // Storage is the model entity for the Storage schema.
diff --git a/engine/client.go b/engine/client.go
index 9883075..5f4a3e6 100644
--- a/engine/client.go
+++ b/engine/client.go
@@ -65,6 +65,8 @@ func (c *Engine) reloadUsingBuildinDownloader(h *ent.History) error {
 	if err != nil {
 		return errors.Wrap(err, "download torrent")
 	}
+	t.Start()
+
 	c.tasks.Store(h.ID, &Task{Torrent: t})
 	return nil
 }
@@ -137,6 +139,14 @@ func (c *Engine) reloadTasks() {
 				}
 				c.tasks.Store(t.ID, &Task{Torrent: to})
 			}
+		} else if dl.Implementation == downloadclients.ImplementationBuildin {
+			err := c.reloadUsingBuildinDownloader(t)	
+			if err != nil {
+				log.Warnf("buildin downloader error: %v", err)
+			} else {
+				log.Infof("success reloading buildin task: %v", t.SourceTitle)
+			}
+
 		}
 
 	}
diff --git a/ui/lib/settings/downloader.dart b/ui/lib/settings/downloader.dart
index a75f146..01de8b4 100644
--- a/ui/lib/settings/downloader.dart
+++ b/ui/lib/settings/downloader.dart
@@ -68,13 +68,13 @@ class _DownloaderState extends ConsumerState<DownloaderSettings> {
             children: [
               FormBuilderTextField(
                   name: "name",
-                  enabled: client.idExists(),
+                  enabled: client.implementation != "buildin",
                   decoration: const InputDecoration(labelText: "名称"),
                   validator: FormBuilderValidators.required(),
                   autovalidateMode: AutovalidateMode.onUserInteraction),
               FormBuilderTextField(
                 name: "url",
-                enabled: client.idExists(),
+                enabled: client.implementation != "buildin",
                 decoration: const InputDecoration(
                     labelText: "地址", hintText: "http://127.0.0.1:9091"),
                 autovalidateMode: AutovalidateMode.onUserInteraction,
@@ -82,7 +82,6 @@ class _DownloaderState extends ConsumerState<DownloaderSettings> {
               ),
               FormBuilderTextField(
                   name: "priority",
-                  enabled: client.idExists(),
                   decoration: const InputDecoration(
                       labelText: "优先级", helperText: "1-50, 1最高优先级，50最低优先级"),
                   validator: FormBuilderValidators.integer(),
@@ -99,7 +98,7 @@ class _DownloaderState extends ConsumerState<DownloaderSettings> {
                   children: [
                     FormBuilderSwitch(
                         name: "auth",
-                        enabled: client.idExists(),
+                        enabled: client.implementation != "buildin",
                         title: const Text("需要认证"),
                         initialValue: _enableAuth,
                         onChanged: (v) {
@@ -166,7 +165,7 @@ class _DownloaderState extends ConsumerState<DownloaderSettings> {
     }
 
     return showSettingDialog(
-        context, title, client.idExists(), body, onSubmit, onDelete);
+        context, title, client.idExists() && client.implementation != "buildin", body, onSubmit, onDelete);
   }
 
   Future<void> showSelections() {