diff --git a/app/(admin)/settings/admin-settings-client.tsx b/app/(admin)/settings/admin-settings-client.tsx
index c93163bfa..d8a3c621e 100644
--- a/app/(admin)/settings/admin-settings-client.tsx
+++ b/app/(admin)/settings/admin-settings-client.tsx
@@ -771,6 +771,7 @@ type AiModel = {
   isEnabled: boolean;
   isHidden: boolean;
   isDefault: boolean;
+  isDefaultTextEditModel?: boolean;
   isSubModel?: boolean;
   parentModelId?: string | null;
   sortOrder: number;
@@ -3260,6 +3261,7 @@ export function AdminSettingsClient() {
     isEnabled: true,
     isHidden: false,
     isDefault: false,
+    isDefaultTextEditModel: false,
     isAgentModel: false,
     agentCodingModelId: "",
     isMultimodal: false,
@@ -6499,6 +6501,7 @@ export function AdminSettingsClient() {
       isEnabled: true,
       isHidden: false,
       isDefault: false,
+      isDefaultTextEditModel: false,
       isAgentModel: false,
       agentCodingModelId: "",
       isMultimodal: false,
@@ -14194,6 +14197,10 @@ export function AdminSettingsClient() {
                                 setModelForm({
                                   ...modelForm,
                                   supportsImageGen: checked,
+                                  isDefaultTextEditModel:
+                                    checked
+                                      ? modelForm.isDefaultTextEditModel
+                                      : false,
                                 })
                               }
                             />
@@ -14231,6 +14238,30 @@ export function AdminSettingsClient() {
                               </Label>
                             </div>
                           </div>
+                          <div className="flex items-center gap-2">
+                            <Switch
+                              checked={modelForm.isDefaultTextEditModel}
+                              disabled={!modelForm.supportsImageGen}
+                              onCheckedChange={(checked) =>
+                                setModelForm({
+                                  ...modelForm,
+                                  isDefaultTextEditModel: checked,
+                                })
+                              }
+                            />
+                            <Label
+                              className={
+                                modelForm.supportsImageGen
+                                  ? ""
+                                  : "text-muted-foreground"
+                              }
+                            >
+                              默认文字编辑生图模型（无限画布文字编辑使用）
+                            </Label>
+                          </div>
+                          <p className="text-xs text-muted-foreground">
+                            建议给可用的火山生图模型开启。未配置时，系统仍会回退到当前可用的火山生图模型。
+                          </p>
                           <div className="flex items-center gap-2">
                             <Switch
                               checked={modelForm.isHidden}
@@ -14981,6 +15012,11 @@ export function AdminSettingsClient() {
                                 默认
                               </span>
                             )}
+                            {model.isDefaultTextEditModel && (
+                              <span className="text-xs bg-fuchsia-100 text-fuchsia-800 px-2 py-0.5 rounded">
+                                文字编辑默认
+                              </span>
+                            )}
                             {model.isAgentModel && (
                               <span className="text-xs bg-violet-100 text-violet-800 px-2 py-0.5 rounded">
                                 Agent
@@ -15040,6 +15076,8 @@ export function AdminSettingsClient() {
                               isEnabled: model.isEnabled,
                               isHidden: model.isHidden || false,
                               isDefault: model.isDefault,
+                              isDefaultTextEditModel:
+                                model.isDefaultTextEditModel || false,
                               isAgentModel: model.isAgentModel || false,
                               agentCodingModelId:
                                 model.agentCodingModelId || "",
diff --git a/app/api/admin/ai-models/route.ts b/app/api/admin/ai-models/route.ts
index 7038e4dc1..5383f7f81 100644
--- a/app/api/admin/ai-models/route.ts
+++ b/app/api/admin/ai-models/route.ts
@@ -74,6 +74,7 @@ const createModelSchema = z.object({
   isEnabled: z.boolean().optional(),
   isHidden: z.boolean().optional(),
   isDefault: z.boolean().optional(),
+  isDefaultTextEditModel: z.boolean().optional(),
   sortOrder: z.number().optional(),
   fallbackModelId1: z.string().max(128).optional(),
   fallbackModelId2: z.string().max(128).optional(),
@@ -97,6 +98,7 @@ const updateModelSchema = z.object({
   isEnabled: z.boolean().optional(),
   isHidden: z.boolean().optional(),
   isDefault: z.boolean().optional(),
+  isDefaultTextEditModel: z.boolean().optional(),
   sortOrder: z.number().optional(),
   fallbackModelId1: z.string().max(128).optional(),
   fallbackModelId2: z.string().max(128).optional(),
diff --git a/app/api/canvas/text-edit/route.ts b/app/api/canvas/text-edit/route.ts
index 311e27843..1ffb68119 100644
--- a/app/api/canvas/text-edit/route.ts
+++ b/app/api/canvas/text-edit/route.ts
@@ -19,15 +19,17 @@ const requestSchema = z.object({
   items: z.array(textItemSchema).min(1, "至少需要一条文字修改"),
 });
 
-function pickVolcanoModel(models: Awaited<ReturnType<typeof getEnabledAiModelsWithProvider>>) {
+function pickTextEditModel(models: Awaited<ReturnType<typeof getEnabledAiModelsWithProvider>>) {
   const candidates = models
     .filter((item) => item.model.supportsImageGen && item.provider.type === "volcano-vision")
     .sort((a, b) => {
       const aScore =
+        (a.model.isDefaultTextEditModel ? 100 : 0) +
         (a.model.isDefault ? 10 : 0) +
         (a.model.modelId?.toLowerCase().includes("seedream") ? 5 : 0) +
         (a.model.displayName?.includes("火山") ? 3 : 0);
       const bScore =
+        (b.model.isDefaultTextEditModel ? 100 : 0) +
         (b.model.isDefault ? 10 : 0) +
         (b.model.modelId?.toLowerCase().includes("seedream") ? 5 : 0) +
         (b.model.displayName?.includes("火山") ? 3 : 0);
@@ -148,12 +150,27 @@ export async function POST(request: Request) {
     }
 
     const models = await getEnabledAiModelsWithProvider();
-    const selected = pickVolcanoModel(models);
+    const selected = pickTextEditModel(models);
 
     if (!selected) {
-      return NextResponse.json({ success: false, error: "未配置可用的火山生图模型" }, { status: 500 });
+      return NextResponse.json(
+        {
+          success: false,
+          error: "未配置可用的文字编辑生图模型，请在系统设置-AI 模型中启用一个火山生图模型并设为默认文字编辑生图模型",
+        },
+        { status: 500 },
+      );
     }
 
+    console.info("[Canvas Text Edit] selected model:", {
+      providerType: selected.provider.type,
+      providerName: selected.provider.name,
+      modelId: selected.model.modelId,
+      displayName: selected.model.displayName,
+      isDefault: selected.model.isDefault,
+      isDefaultTextEditModel: selected.model.isDefaultTextEditModel,
+    });
+
     const provider = createVolcanoVision({
       baseURL: selected.provider.baseUrl,
       apiKey: selected.provider.apiKey,
diff --git a/lib/db/migrate.ts b/lib/db/migrate.ts
index b5b445b7e..3aa4d011b 100644
--- a/lib/db/migrate.ts
+++ b/lib/db/migrate.ts
@@ -105,6 +105,10 @@ const runMigrate = async () => {
     ALTER TABLE "AiModel"
     ADD COLUMN IF NOT EXISTS "excludeFromFailover" boolean NOT NULL DEFAULT false;
   `);
+  await db.execute(sql`
+    ALTER TABLE "AiModel"
+    ADD COLUMN IF NOT EXISTS "isDefaultTextEditModel" boolean NOT NULL DEFAULT false;
+  `);
   for (const item of providerBaseUrlDefaults) {
     await db.execute(sql`
       UPDATE "AiProvider"
diff --git a/lib/db/migrations/0076_add_ai_model_text_edit_default.sql b/lib/db/migrations/0076_add_ai_model_text_edit_default.sql
new file mode 100644
index 000000000..7372a9020
--- /dev/null
+++ b/lib/db/migrations/0076_add_ai_model_text_edit_default.sql
@@ -0,0 +1,2 @@
+ALTER TABLE "AiModel"
+ADD COLUMN IF NOT EXISTS "isDefaultTextEditModel" boolean NOT NULL DEFAULT false;
diff --git a/lib/db/migrations/meta/_journal.json b/lib/db/migrations/meta/_journal.json
index 0e291c8e9..cc74ac8df 100644
--- a/lib/db/migrations/meta/_journal.json
+++ b/lib/db/migrations/meta/_journal.json
@@ -435,6 +435,13 @@
       "when": 1777276800000,
       "tag": "0075_add_agent_workflow_default_model",
       "breakpoints": true
+    },
+    {
+      "idx": 62,
+      "version": "7",
+      "when": 1777305600000,
+      "tag": "0076_add_ai_model_text_edit_default",
+      "breakpoints": true
     }
   ]
 }
diff --git a/lib/db/queries.ts b/lib/db/queries.ts
index 01e70f462..0ec95b293 100644
--- a/lib/db/queries.ts
+++ b/lib/db/queries.ts
@@ -3941,6 +3941,7 @@ export async function createAiModel({
   isEnabled,
   isHidden,
   isDefault,
+  isDefaultTextEditModel,
   sortOrder,
   fallbackModelId1,
   fallbackModelId2,
@@ -3961,6 +3962,7 @@ export async function createAiModel({
   isEnabled?: boolean;
   isHidden?: boolean;
   isDefault?: boolean;
+  isDefaultTextEditModel?: boolean;
   sortOrder?: number;
   fallbackModelId1?: string;
   fallbackModelId2?: string;
@@ -3980,6 +3982,13 @@ export async function createAiModel({
         .where(eq(aiModel.isDefault, true));
     }
 
+    if (isDefaultTextEditModel) {
+      await db
+        .update(aiModel)
+        .set({ isDefaultTextEditModel: false })
+        .where(eq(aiModel.isDefaultTextEditModel, true));
+    }
+
     const defaultParams =
       agentCodingModelId !== undefined
         ? withAgentCodingModelId(
@@ -4003,6 +4012,7 @@ export async function createAiModel({
         isEnabled: isEnabled ?? true,
         isHidden: isHidden ?? false,
         isDefault: isDefault ?? false,
+        isDefaultTextEditModel: isDefaultTextEditModel ?? false,
         sortOrder: sortOrder ?? 0,
         fallbackModelId1: fallbackModelId1 || null,
         fallbackModelId2: fallbackModelId2 || null,
@@ -4035,6 +4045,7 @@ export async function updateAiModel({
   isEnabled,
   isHidden,
   isDefault,
+  isDefaultTextEditModel,
   sortOrder,
   fallbackModelId1,
   fallbackModelId2,
@@ -4056,6 +4067,7 @@ export async function updateAiModel({
   isEnabled?: boolean;
   isHidden?: boolean;
   isDefault?: boolean;
+  isDefaultTextEditModel?: boolean;
   sortOrder?: number;
   fallbackModelId1?: string;
   fallbackModelId2?: string;
@@ -4075,6 +4087,13 @@ export async function updateAiModel({
         .where(eq(aiModel.isDefault, true));
     }
 
+    if (isDefaultTextEditModel) {
+      await db
+        .update(aiModel)
+        .set({ isDefaultTextEditModel: false })
+        .where(eq(aiModel.isDefaultTextEditModel, true));
+    }
+
     const updateData: any = { updatedAt: new Date() };
     if (providerId !== undefined) updateData.providerId = providerId;
     if (modelId !== undefined) updateData.modelId = modelId;
@@ -4087,6 +4106,9 @@ export async function updateAiModel({
     if (isEnabled !== undefined) updateData.isEnabled = isEnabled;
     if (isHidden !== undefined) updateData.isHidden = isHidden;
     if (isDefault !== undefined) updateData.isDefault = isDefault;
+    if (isDefaultTextEditModel !== undefined) {
+      updateData.isDefaultTextEditModel = isDefaultTextEditModel;
+    }
     if (sortOrder !== undefined) updateData.sortOrder = sortOrder;
     // 备用模型 ID（空字符串转为 null）
     if (fallbackModelId1 !== undefined) updateData.fallbackModelId1 = fallbackModelId1 || null;
diff --git a/lib/db/schema.ts b/lib/db/schema.ts
index a750be413..06ff7fc51 100644
--- a/lib/db/schema.ts
+++ b/lib/db/schema.ts
@@ -304,6 +304,7 @@ export const aiModel = pgTable("AiModel", {
   isEnabled: boolean("isEnabled").notNull().default(true), // 是否启用
   isHidden: boolean("isHidden").notNull().default(false), // 是否在前端模型选择中隐藏
   isDefault: boolean("isDefault").notNull().default(false), // 是否为默认模型
+  isDefaultTextEditModel: boolean("isDefaultTextEditModel").notNull().default(false), // 是否为默认文字编辑生图模型
   sortOrder: integer("sortOrder").notNull().default(0), // 排序顺序
   capabilities: jsonb("capabilities"), // 🆕 模型能力配置（用于视频模型）
   defaultParams: jsonb("defaultParams"), // 🆕 默认参数配置