diff --git a/lib/backend/models.js b/lib/backend/models.js
index 6ae318f..a8e49ea 100644
--- a/lib/backend/models.js
+++ b/lib/backend/models.js
@@ -1,46 +1,151 @@
-// LMArena 完整模型映射 (模型名 -> UUID)
-export const LMARENA_MODEL_MAPPING = {
-    "gemini-3-pro-image-preview": "019aa208-5c19-7162-ae3b-0a9ddbb1e16a",
-    "seedream-4-high-res-fal": "32974d8d-333c-4d2e-abf3-f258c0ac1310",
-    "hunyuan-image-3.0": "7766a45c-1b6b-4fb8-9823-2557291e1ddd",
-    "gemini-2.5-flash-image-preview": "0199ef2a-583f-7088-b704-b75fd169401d",
-    "imagen-4.0-ultra-generate-preview-06-06": "f8aec69d-e077-4ed1-99be-d34f48559bbf",
-    "imagen-4.0-generate-preview-06-06": "2ec9f1a6-126f-4c65-a102-15ac401dcea4",
-    "wan2.5-t2i-preview": "019a5050-2875-78ed-ae3a-d9a51a438685",
-    "gpt-image-1": "6e855f13-55d7-4127-8656-9168a9f4dcc0",
-    "gpt-image-mini": "0199c238-f8ee-7f7d-afc1-7e28fcfd21cf",
-    "mai-image-1": "1b407d5c-1806-477c-90a5-e5c5a114f3bc",
-    "seedream-3": "d8771262-8248-4372-90d5-eb41910db034",
-    "qwen-image-prompt-extend": "9fe82ee1-c84f-417f-b0e7-cab4ae4cf3f3",
-    "flux-1-kontext-pro": "28a8f330-3554-448c-9f32-2c0a08ec6477",
-    "imagen-3.0-generate-002": "51ad1d79-61e2-414c-99e3-faeb64bb6b1b",
-    "ideogram-v3-quality": "73378be5-cdba-49e7-b3d0-027949871aa6",
-    "photon": "e7c9fa2d-6f5d-40eb-8305-0980b11c7cab",
-    "lucid-origin": "5a3b3520-c87d-481f-953c-1364687b6e8f",
-    "recraft-v3": "b88d5814-1d20-49cc-9eb6-e362f5851661",
-    "gemini-2.0-flash-preview-image-generation": "69bbf7d4-9f44-447e-a868-abc4f7a31810",
-    "dall-e-3": "bb97bc68-131c-4ea4-a59e-03a6252de0d2",
-    "flux-1-kontext-dev": "eb90ae46-a73a-4f27-be8b-40f090592c9a",
-    "imagen-4.0-fast-generate-001": "f44fd4f8-af30-480f-8ce2-80b2bdfea55e",
-    "hunyuan-image-2.1": "a9a26426-5377-4efa-bef9-de71e29ad943"
+// 图片策略枚举
+export const IMAGE_POLICY = {
+    OPTIONAL: 'optional',   // 可带可不带（默认）
+    REQUIRED: 'required',   // 必须有参考图
+    FORBIDDEN: 'forbidden'  // 禁止带图
 };
 
-// GeminiBiz 支持的模型列表 (仅需验证模型 ID,不需要 UUID)
-export const GEMINI_BIZ_SUPPORTED_MODELS = [
-    "gemini-3-pro-image-preview"
-];
+// LMArena 后端模型配置
+export const LMARENA_MODELS = {
+    "gemini-3-pro-image-preview": {
+        codeName: "019aa208-5c19-7162-ae3b-0a9ddbb1e16a",
+        imagePolicy: IMAGE_POLICY.OPTIONAL
+    },
+    "seedream-4-high-res-fal": {
+        codeName: "32974d8d-333c-4d2e-abf3-f258c0ac1310",
+        imagePolicy: IMAGE_POLICY.OPTIONAL
+    },
+    "hunyuan-image-3.0": {
+        codeName: "7766a45c-1b6b-4fb8-9823-2557291e1ddd",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "gemini-2.5-flash-image-preview": {
+        codeName: "0199ef2a-583f-7088-b704-b75fd169401d",
+        imagePolicy: IMAGE_POLICY.OPTIONAL
+    },
+    "imagen-4.0-ultra-generate-preview-06-06": {
+        codeName: "f8aec69d-e077-4ed1-99be-d34f48559bbf",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "imagen-4.0-generate-preview-06-06": {
+        codeName: "2ec9f1a6-126f-4c65-a102-15ac401dcea4",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "wan2.5-t2i-preview": {
+        codeName: "019a5050-2875-78ed-ae3a-d9a51a438685",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "gpt-image-1": {
+        codeName: "6e855f13-55d7-4127-8656-9168a9f4dcc0",
+        imagePolicy: IMAGE_POLICY.OPTIONAL
+    },
+    "gpt-image-mini": {
+        codeName: "0199c238-f8ee-7f7d-afc1-7e28fcfd21cf",
+        imagePolicy: IMAGE_POLICY.OPTIONAL
+    },
+    "mai-image-1": {
+        codeName: "1b407d5c-1806-477c-90a5-e5c5a114f3bc",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "seedream-3": {
+        codeName: "d8771262-8248-4372-90d5-eb41910db034",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "qwen-image-prompt-extend": {
+        codeName: "9fe82ee1-c84f-417f-b0e7-cab4ae4cf3f3",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "flux-1-kontext-pro": {
+        codeName: "28a8f330-3554-448c-9f32-2c0a08ec6477",
+        imagePolicy: IMAGE_POLICY.OPTIONAL
+    },
+    "imagen-3.0-generate-002": {
+        codeName: "51ad1d79-61e2-414c-99e3-faeb64bb6b1b",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "ideogram-v3-quality": {
+        codeName: "73378be5-cdba-49e7-b3d0-027949871aa6",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "photon": {
+        codeName: "e7c9fa2d-6f5d-40eb-8305-0980b11c7cab",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "lucid-origin": {
+        codeName: "5a3b3520-c87d-481f-953c-1364687b6e8f",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "recraft-v3": {
+        codeName: "b88d5814-1d20-49cc-9eb6-e362f5851661",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "gemini-2.0-flash-preview-image-generation": {
+        codeName: "69bbf7d4-9f44-447e-a868-abc4f7a31810",
+        imagePolicy: IMAGE_POLICY.OPTIONAL
+    },
+    "dall-e-3": {
+        codeName: "bb97bc68-131c-4ea4-a59e-03a6252de0d2",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "flux-1-kontext-dev": {
+        codeName: "eb90ae46-a73a-4f27-be8b-40f090592c9a",
+        imagePolicy: IMAGE_POLICY.OPTIONAL
+    },
+    "imagen-4.0-fast-generate-001": {
+        codeName: "f44fd4f8-af30-480f-8ce2-80b2bdfea55e",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "flux-2-pro": {
+        codeName: "019abcf4-5600-7a8b-864d-9b8ab7ab7328",
+        imagePolicy: IMAGE_POLICY.OPTIONAL
+    },
+    "flux-2-flex": {
+        codeName: "019abed6-d96e-7a2b-bf69-198c28bef281",
+        imagePolicy: IMAGE_POLICY.OPTIONAL
+    },
+    "hunyuan-image-2.1": {
+        codeName: "a9a26426-5377-4efa-bef9-de71e29ad943",
+        imagePolicy: IMAGE_POLICY.FORBIDDEN
+    },
+    "qwen-image-edit": {
+        codeName: "995cf221-af30-466d-a809-8e0985f83649",
+        imagePolicy: IMAGE_POLICY.REQUIRED
+    },
+    "reve-v1": {
+        codeName: "0199e980-ba42-737b-9436-927b6e7ca73e",
+        imagePolicy: IMAGE_POLICY.REQUIRED
+    },
+    "reve-fast-edit": {
+        codeName: "019a5675-0a56-7835-abdd-1cb9e7870afa",
+        imagePolicy: IMAGE_POLICY.REQUIRED
+    }
+};
+
+// Gemini Biz 后端模型配置
+export const GEMINI_BIZ_MODELS = {
+    "gemini-3-pro-image-preview": {
+        imagePolicy: IMAGE_POLICY.OPTIONAL
+    }
+};
 
 /**
- * 获取后端对应的模型映射或列表
+ * 获取后端对应的模型配置表
  * @param {string} backendName - 后端名称 ('lmarena' 或 'gemini_biz')
- * @returns {Object|Array} LMArena 返回映射对象,GeminiBiz 返回支持的模型数组
+ * @returns {Object} 模型配置对象
  * @private
  */
-function getMapForBackend(backendName) {
-    if (backendName === 'gemini_biz') {
-        return GEMINI_BIZ_SUPPORTED_MODELS;
+function getModelsConfigForBackend(backendName) {
+    switch (backendName) {
+        case 'lmarena':
+            return LMARENA_MODELS;
+        case 'gemini_biz':
+            return GEMINI_BIZ_MODELS;
+        // 将来新增其它后端：
+        // case 'foo_site':
+        //   return FOO_SITE_MODELS;
+        default:
+            return {};
     }
-    return LMARENA_MODEL_MAPPING;
 }
 
 /**
@@ -49,16 +154,8 @@ function getMapForBackend(backendName) {
  * @returns {Object} OpenAI 格式的模型列表
  */
 export function getModelsForBackend(backendName) {
-    const map = getMapForBackend(backendName);
-
-    let modelIds;
-    if (backendName === 'gemini_biz') {
-        // GeminiBiz: 直接使用支持的模型列表
-        modelIds = map;
-    } else {
-        // LMArena: 从映射对象中提取键
-        modelIds = Object.keys(map);
-    }
+    const modelsConf = getModelsConfigForBackend(backendName);
+    const modelIds = Object.keys(modelsConf);
 
     return {
         object: 'list',
@@ -66,7 +163,9 @@ export function getModelsForBackend(backendName) {
             id,
             object: 'model',
             created: Math.floor(Date.now() / 1000),
-            owned_by: backendName === 'gemini_biz' ? 'gemini_biz' : 'lmarena'
+            owned_by: backendName,
+            // 向前端暴露图片策略
+            image_policy: modelsConf[id].imagePolicy || IMAGE_POLICY.OPTIONAL
         }))
     };
 }
@@ -75,20 +174,32 @@ export function getModelsForBackend(backendName) {
  * 解析模型 ID
  * @param {string} backendName - 后端名称
  * @param {string} modelKey - 请求的模型键
- * @returns {string|null} LMArena 返回 UUID,GeminiBiz 返回模型 ID (验证通过) 或 null
+ * @returns {string|null} 返回内部使用的 codeName，若模型无效则返回 null
  */
 export function resolveModelId(backendName, modelKey) {
-    if (backendName === 'gemini_biz') {
-        // GeminiBiz: 只验证模型是否在支持列表中
-        return GEMINI_BIZ_SUPPORTED_MODELS.includes(modelKey) ? modelKey : null;
+    const modelsConf = getModelsConfigForBackend(backendName);
+    const model = modelsConf[modelKey];
+
+    if (!model) return null; // 未配置的模型 -> 无效
+
+    // 无 codeName 时，退回到模型 ID 本身
+    return model.codeName || modelKey;
+}
+
+/**
+ * 获取模型的图片策略
+ * @param {string} backendName - 后端名称
+ * @param {string} modelKey - 模型键
+ * @returns {string} 图片策略 ('optional' | 'required' | 'forbidden')
+ */
+export function getImagePolicy(backendName, modelKey) {
+    const modelsConf = getModelsConfigForBackend(backendName);
+    const model = modelsConf[modelKey];
+
+    if (!model || !model.imagePolicy) {
+        return IMAGE_POLICY.OPTIONAL;
     }
 
-    // LMArena: 返回 UUID
-    return LMARENA_MODEL_MAPPING[modelKey] || null;
+    return model.imagePolicy;
 }
 
-// 保留旧的导出以兼容 (如果有其他地方还在使用)
-export const MODEL_MAPPING = LMARENA_MODEL_MAPPING;
-export function getModels() {
-    return getModelsForBackend('lmarena');
-}
diff --git a/server.js b/server.js
index ba5cc80..6ba0bde 100644
--- a/server.js
+++ b/server.js
@@ -3,7 +3,7 @@ import fs from 'fs';
 import path from 'path';
 import sharp from 'sharp';
 import { getBackend } from './lib/backend/index.js';
-import { getModelsForBackend, resolveModelId } from './lib/backend/models.js';
+import { getModelsForBackend, resolveModelId, getImagePolicy, IMAGE_POLICY } from './lib/backend/models.js';
 import { logger } from './lib/logger.js';
 import crypto from 'crypto';
 
@@ -314,8 +314,29 @@ async function startServer() {
                         logger.info('服务器', '未指定模型，使用网页默认', { id });
                     }
 
+                    // 图片策略校验
+                    const hasImage = imagePaths.length > 0;
+                    const policy = data.model ? getImagePolicy(name, data.model) : IMAGE_POLICY.OPTIONAL;
+
+                    if (policy === IMAGE_POLICY.REQUIRED && !hasImage) {
+                        const errorMsg = `Model ${data.model} requires a reference image.`;
+                        logger.warn('服务器', errorMsg, { id });
+                        if (isQueueMode) { sseHelper.send('error', { msg: errorMsg }); sseHelper.end(); }
+                        else { res.writeHead(400); res.end(JSON.stringify({ error: errorMsg })); }
+                        return;
+                    }
+
+                    if (policy === IMAGE_POLICY.FORBIDDEN && hasImage) {
+                        const errorMsg = `Model ${data.model} does not accept images.`;
+                        logger.warn('服务器', errorMsg, { id });
+                        if (isQueueMode) { sseHelper.send('error', { msg: errorMsg }); sseHelper.end(); }
+                        else { res.writeHead(400); res.end(JSON.stringify({ error: errorMsg })); }
+                        return;
+                    }
+
                     logger.info('服务器', `[队列] 请求入队: ${prompt.slice(0, 10)}...`, { id, images: imagePaths.length });
 
+
                     if (isQueueMode) {
                         sseHelper.send('status', { status: 'queued', position: queue.length + 1 });
                     }