diff --git a/app/(admin)/settings/admin-settings-client.tsx b/app/(admin)/settings/admin-settings-client.tsx
index 3c8892b0b..a7970e500 100644
--- a/app/(admin)/settings/admin-settings-client.tsx
+++ b/app/(admin)/settings/admin-settings-client.tsx
@@ -199,6 +199,7 @@ type SiteSettings = {
   aiDetailGenerationEnabled: boolean;
   canvasDefaultModelId: string | null;
   canvasAutoModeDefaultModelId: string | null;
+  canvasDetailDefaultModelId: string | null;
   lovartComposerPrefix: string;
   lovartComposerPreviewTexts: string[];
   lovartPromptTagVisibility: LovartPromptTagVisibility;
@@ -520,6 +521,7 @@ export function AdminSettingsClient() {
     aiDetailGenerationEnabled: false,
     canvasDefaultModelId: null,
     canvasAutoModeDefaultModelId: null,
+    canvasDetailDefaultModelId: null,
     lovartComposerPrefix: "让Buyi-ai",
     lovartComposerPreviewTexts: [
       "打造引人注目的社交媒体视觉",
@@ -587,6 +589,7 @@ export function AdminSettingsClient() {
         aiDetailGenerationEnabled: siteSettingsData.aiDetailGenerationEnabled ?? false,
         canvasDefaultModelId: siteSettingsData.canvasDefaultModelId || null,
         canvasAutoModeDefaultModelId: siteSettingsData.canvasAutoModeDefaultModelId || null,
+        canvasDetailDefaultModelId: siteSettingsData.canvasDetailDefaultModelId || null,
         lovartComposerPrefix:
           String((siteSettingsData as any).lovartComposerPrefix || "").trim() ||
           "让Buyi-ai",
@@ -4556,6 +4559,34 @@ export function AdminSettingsClient() {
                         />
                       </div>
 
+                      <div className="space-y-2 mt-4">
+                        <Label htmlFor="canvasDetailDefaultModelId">AI详情生成 - 默认生图模型</Label>
+                        <Select
+                          value={siteSettings.canvasDetailDefaultModelId || "agent-default"}
+                          onValueChange={(value) =>
+                            setSiteSettings({
+                              ...siteSettings,
+                              canvasDetailDefaultModelId: value === "agent-default" ? null : value,
+                            })
+                          }
+                        >
+                          <SelectTrigger id="canvasDetailDefaultModelId">
+                            <SelectValue placeholder="选择默认模型" />
+                          </SelectTrigger>
+                          <SelectContent>
+                            <SelectItem value="agent-default">沿用Agent模式默认生图模型</SelectItem>
+                            {modelsData?.models?.filter((m: any) => m.supportsImageGen).map((model: any) => (
+                              <SelectItem key={model.id} value={model.id}>
+                                {model.displayName}
+                              </SelectItem>
+                            ))}
+                          </SelectContent>
+                        </Select>
+                        <div className="text-xs text-muted-foreground">
+                          仅用于AI详情生成（含详情图与评价晒图）的默认出图模型；不影响普通生图模式。
+                        </div>
+                      </div>
+
                       <div className="space-y-2">
                         <Label htmlFor="canvasDefaultModelId">画布默认生图模型</Label>
                         <Select
diff --git a/app/api/site-settings/route.ts b/app/api/site-settings/route.ts
index d31004771..7cb3f7c11 100644
--- a/app/api/site-settings/route.ts
+++ b/app/api/site-settings/route.ts
@@ -285,6 +285,7 @@ export async function GET() {
         canvasEnabled: true,
         canvasDefaultModelId: null,
         canvasAutoModeDefaultModelId: null,
+        canvasDetailDefaultModelId: null,
         lovartPromoText: "现在升级，立享 Kling 3.0 与 Nano Banana Pro，最高 5 折优惠",
         lovartPromoActionText: "立即升级",
         lovartHeroTitle: "由壹点AI 让设计更简单",
@@ -366,6 +367,7 @@ const updateSchema = z.object({
   aiDetailGenerationEnabled: z.boolean().optional(),
   canvasDefaultModelId: z.string().nullable().optional(),
   canvasAutoModeDefaultModelId: z.string().nullable().optional(),
+  canvasDetailDefaultModelId: z.string().nullable().optional(),
   lovartPromoText: z.string().max(300).optional(),
   lovartPromoActionText: z.string().max(32).optional(),
   lovartHeroTitle: z.string().max(300).optional(),
@@ -754,6 +756,7 @@ export async function PUT(request: NextRequest) {
           canvasEnabled: siteSettingsPayload.canvasEnabled ?? true,
           canvasDefaultModelId: siteSettingsPayload.canvasDefaultModelId,
           canvasAutoModeDefaultModelId: siteSettingsPayload.canvasAutoModeDefaultModelId,
+          canvasDetailDefaultModelId: siteSettingsPayload.canvasDetailDefaultModelId,
           lovartPromoText:
             siteSettingsPayload.lovartPromoText ??
             "现在升级，立享 Kling 3.0 与 Nano Banana Pro，最高 5 折优惠",
diff --git a/components/canvas/CanvasChatPanel.tsx b/components/canvas/CanvasChatPanel.tsx
index 449bdc4ea..8bfc9c921 100644
--- a/components/canvas/CanvasChatPanel.tsx
+++ b/components/canvas/CanvasChatPanel.tsx
@@ -1865,6 +1865,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     aiDetailGenerationEnabled?: boolean;
     canvasDefaultModelId?: string | null;
     canvasAutoModeDefaultModelId?: string | null;
+    canvasDetailDefaultModelId?: string | null;
   }>("/api/site-settings", fetcher);
   const { data: membershipSummary } = useSWR<{
     pointsSystemConfig?: {
@@ -3553,7 +3554,8 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
       const modelForGeneration =
         selectedModelId !== "auto"
           ? selectedModelId
-          : siteSettings?.canvasAutoModeDefaultModelId ||
+          : siteSettings?.canvasDetailDefaultModelId ||
+            siteSettings?.canvasAutoModeDefaultModelId ||
             siteSettings?.canvasDefaultModelId ||
             undefined;
       for (let index = 0; index < prompts.length; index += 1) {
@@ -3973,6 +3975,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     saveDetailArchiveSnapshot,
     setMessages,
     siteSettings?.canvasAutoModeDefaultModelId,
+    siteSettings?.canvasDetailDefaultModelId,
     siteSettings?.canvasDefaultModelId,
     updateLocalDetailArchive,
   ]);
@@ -4030,7 +4033,8 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     const modelForGeneration =
       selectedModelId !== "auto"
         ? selectedModelId
-        : siteSettings?.canvasAutoModeDefaultModelId ||
+        : siteSettings?.canvasDetailDefaultModelId ||
+          siteSettings?.canvasAutoModeDefaultModelId ||
           siteSettings?.canvasDefaultModelId ||
           undefined;
     const existingImageBottom = nodes
@@ -4251,6 +4255,7 @@ export function CanvasChatPanel({ chatId, initialMessages = [], onClose, onOpenF
     selectedModelId,
     setMessages,
     siteSettings?.canvasAutoModeDefaultModelId,
+    siteSettings?.canvasDetailDefaultModelId,
     siteSettings?.canvasDefaultModelId,
   ]);
 
diff --git a/lib/db/migrations/0040_add_canvas_detail_default_model.sql b/lib/db/migrations/0040_add_canvas_detail_default_model.sql
new file mode 100644
index 000000000..355ad949a
--- /dev/null
+++ b/lib/db/migrations/0040_add_canvas_detail_default_model.sql
@@ -0,0 +1,2 @@
+ALTER TABLE "SiteSettings"
+ADD COLUMN IF NOT EXISTS "canvasDetailDefaultModelId" varchar(128);
diff --git a/lib/db/migrations/meta/_journal.json b/lib/db/migrations/meta/_journal.json
index b3ca33da6..96c0b36e7 100644
--- a/lib/db/migrations/meta/_journal.json
+++ b/lib/db/migrations/meta/_journal.json
@@ -183,6 +183,13 @@
       "when": 1771588800000,
       "tag": "0039_add_ai_model_hidden",
       "breakpoints": true
+    },
+    {
+      "idx": 26,
+      "version": "7",
+      "when": 1771718400000,
+      "tag": "0040_add_canvas_detail_default_model",
+      "breakpoints": true
     }
   ]
 }
diff --git a/lib/db/schema.ts b/lib/db/schema.ts
index 4d43a8208..d34a8a55c 100644
--- a/lib/db/schema.ts
+++ b/lib/db/schema.ts
@@ -355,6 +355,7 @@ export const siteSettings = pgTable("SiteSettings", {
   canvasEnabled: boolean("canvasEnabled").notNull().default(true), // 是否启用无限画布功能
   canvasDefaultModelId: varchar("canvasDefaultModelId", { length: 128 }), // 画布默认选择的模型ID（null表示智能自动）
   canvasAutoModeDefaultModelId: varchar("canvasAutoModeDefaultModelId", { length: 128 }), // 智能自动模式下实际使用的默认生图模型ID
+  canvasDetailDefaultModelId: varchar("canvasDetailDefaultModelId", { length: 128 }), // AI详情生成专用默认生图模型ID
   lovartPromoText: text("lovartPromoText").default(
     "现在升级，立享 Kling 3.0 与 Nano Banana Pro，最高 5 折优惠"
   ),