diff --git a/app/web/src/components/pages/MountsBody.tsx b/app/web/src/components/pages/MountsBody.tsx
index 565380d..40eb6f2 100644
--- a/app/web/src/components/pages/MountsBody.tsx
+++ b/app/web/src/components/pages/MountsBody.tsx
@@ -183,6 +183,8 @@ function MountsInner(props: { locale: Locale }) {
             username: form.username.trim() || undefined,
             password: form.password || undefined,
             rootPath: form.rootPath.trim() || "/",
+            // 编辑留空密码时由服务端复用已存密文
+            mountId: mode === "edit" ? (editId ?? undefined) : undefined,
         });
     }
 
diff --git a/packages/trpc/src/router/media.router.ts b/packages/trpc/src/router/media.router.ts
index 90cbbf5..44b32f5 100644
--- a/packages/trpc/src/router/media.router.ts
+++ b/packages/trpc/src/router/media.router.ts
@@ -28,7 +28,7 @@ export const mediaRouter = t.router({
         .mutation(({ ctx, input }) => mountService.delete(ctx.userId, input.id)),
     mountTest: protectedProcedure
         .input(mountSchemas.test)
-        .mutation(({ input }) => mountService.test(input)),
+        .mutation(({ ctx, input }) => mountService.test(input, ctx.userId)),
     mountListDir: protectedProcedure
         .input(mountSchemas.listDir)
         .query(({ ctx, input }) => mountService.listDir(ctx.userId, input)),
diff --git a/packages/trpc/src/services/mount.service.ts b/packages/trpc/src/services/mount.service.ts
index 85b9fef..3095a72 100644
--- a/packages/trpc/src/services/mount.service.ts
+++ b/packages/trpc/src/services/mount.service.ts
@@ -116,8 +116,9 @@ export const mountService = {
             patch["baseUrl"] = input.baseUrl;
         }
         if (input.username !== undefined) patch["username"] = input.username;
-        if (input.password !== undefined) {
-            patch["secretEnc"] = input.password ? encryptSecret(input.password) : "";
+        // 密码留空/未传 = 保持原密文，避免编辑时重复输入
+        if (input.password) {
+            patch["secretEnc"] = encryptSecret(input.password);
         }
         if (input.rootPath !== undefined) patch["rootPath"] = input.rootPath;
         if (input.enabled !== undefined) patch["enabled"] = input.enabled;
@@ -135,22 +136,32 @@ export const mountService = {
         return { success: true, removedItems: removedIds.length };
     },
 
-    async test(input: {
-        baseUrl: string;
-        username?: string | undefined;
-        password?: string | undefined;
-        rootPath: string;
-    }): Promise<{ ok: boolean; message: string }> {
+    async test(
+        input: {
+            baseUrl: string;
+            username?: string | undefined;
+            password?: string | undefined;
+            rootPath: string;
+            mountId?: string | undefined;
+        },
+        userId?: string,
+    ): Promise<{ ok: boolean; message: string }> {
         try {
             assertSafeWebdavUrl(input.baseUrl);
         } catch (e) {
             return { ok: false, message: e instanceof Error ? e.message : "地址不合法" };
         }
+        // 编辑时密码留空：复用已存密文测连，避免每次重填
+        let password = input.password;
+        if (!password && input.mountId && userId) {
+            const existing = await mountDao.getByIdForUser(input.mountId, userId);
+            if (existing?.secretEnc) password = decryptSecret(existing.secretEnc);
+        }
         try {
             const client = createWebdav({
                 baseUrl: input.baseUrl,
                 username: input.username,
-                password: input.password,
+                password,
             });
             // 1) 先探 WebDAV 根：区分「认证/不是 WebDAV」与「根路径写错」
             try {
diff --git a/packages/types/src/media-schemas.ts b/packages/types/src/media-schemas.ts
index 96979d6..28eaf6c 100644
--- a/packages/types/src/media-schemas.ts
+++ b/packages/types/src/media-schemas.ts
@@ -46,6 +46,8 @@ export const mountSchemas = {
         username: z.string().max(200).optional(),
         password: z.string().max(500).optional(),
         rootPath: z.string().max(1000).default("/"),
+        /** 编辑已有挂载时传入：密码留空则复用库内密文 */
+        mountId: z.string().optional(),
     }),
     listDir: z.object({
         mountId: id,