diff --git a/.env.example b/.env.example
index 099819a..6305ef8 100644
--- a/.env.example
+++ b/.env.example
@@ -57,5 +57,5 @@ OPENAI_API_KEY=
 HUAWEI_API_KEY=
 BASE_URL=
 API_KEY=
-MODEL=
+MODEL=deepseek-v4-flash
 OLLAMA_BASE_URL=http://host.docker.internal:11434
diff --git a/docker-compose.yml b/docker-compose.yml
index 7003917..132568d 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -36,7 +36,7 @@ services:
       OLLAMA_BASE_URL: ${OLLAMA_BASE_URL:-http://host.docker.internal:11434}
       BASE_URL: ${BASE_URL:-}
       API_KEY: ${API_KEY:-}
-      MODEL: ${MODEL:-}
+      MODEL: ${MODEL:-deepseek-v4-flash}
     volumes:
       - .:/workspace
       - gradle-cache:/root/.gradle
diff --git a/front/app/env-config/page.tsx b/front/app/env-config/page.tsx
index 5f1ae22..a43191c 100644
--- a/front/app/env-config/page.tsx
+++ b/front/app/env-config/page.tsx
@@ -9,12 +9,14 @@ import { Label } from '@/components/ui/label'
 import PageHeader from '@/app/components/PageHeader'
 import { API_BASE } from '@/lib/api'
 
+const DEFAULT_DEEPSEEK_MODEL = 'deepseek-v4-flash'
+
 export default function EnvConfig() {
   const [envConfig, setEnvConfig] = useState({
     hookUrl: '',
     baseUrl: '',
     apiKey: '',
-    model: '',
+    model: DEFAULT_DEEPSEEK_MODEL,
     botIsSend: 0,
   })
 
@@ -46,7 +48,7 @@ export default function EnvConfig() {
           hookUrl: result.data.HOOK_URL || '',
           baseUrl: result.data.BASE_URL || '',
           apiKey: result.data.API_KEY || '',
-          model: result.data.MODEL || '',
+          model: result.data.MODEL || DEFAULT_DEEPSEEK_MODEL,
           botIsSend: (() => {
             const raw = result.data.BOT_IS_SEND
             const val = String(raw ?? '').trim().toLowerCase()
@@ -207,9 +209,9 @@ export default function EnvConfig() {
                   type="text"
                   value={envConfig.model}
                   onChange={(e) => setEnvConfig({ ...envConfig, model: e.target.value })}
-                  placeholder="deepseek-chat"
+                  placeholder={DEFAULT_DEEPSEEK_MODEL}
                 />
-                <p className="text-xs text-muted-foreground">DeepSeek 推荐模型 deepseek-chat；也可以填写其他 OpenAI-compatible 模型名</p>
+                <p className="text-xs text-muted-foreground">DeepSeek 推荐模型 deepseek-v4-flash；也可以填写其他 OpenAI-compatible 模型名</p>
               </div>
             </div>
           </CardContent>
diff --git a/src/test/java/com/getjobs/application/service/ConfigServiceTest.java b/src/test/java/com/getjobs/application/service/ConfigServiceTest.java
index b679619..cc40ea2 100644
--- a/src/test/java/com/getjobs/application/service/ConfigServiceTest.java
+++ b/src/test/java/com/getjobs/application/service/ConfigServiceTest.java
@@ -70,7 +70,7 @@ void batchUpdateUpdatesExistingConfig() {
         when(configMapper.selectOne(any())).thenReturn(existing);
         when(configMapper.updateById(any(ConfigEntity.class))).thenReturn(1);
 
-        int count = configService.batchUpdateConfigs(Map.of("MODEL", "deepseek-chat"));
+        int count = configService.batchUpdateConfigs(Map.of("MODEL", "deepseek-v4-flash"));
 
         ArgumentCaptor<ConfigEntity> captor = ArgumentCaptor.forClass(ConfigEntity.class);
         verify(configMapper).updateById(captor.capture());
@@ -78,7 +78,7 @@ void batchUpdateUpdatesExistingConfig() {
         ConfigEntity updated = captor.getValue();
         assertThat(count).isEqualTo(1);
         assertThat(updated.getConfigKey()).isEqualTo("MODEL");
-        assertThat(updated.getConfigValue()).isEqualTo("deepseek-chat");
+        assertThat(updated.getConfigValue()).isEqualTo("deepseek-v4-flash");
         assertThat(updated.getUpdatedAt()).isNotNull();
     }
 
@@ -90,14 +90,14 @@ void getAiConfigsFallsBackToEnvironmentWhenDatabaseValueIsBlank() {
                 .thenReturn(blankConfig("MODEL"));
         when(environment.getProperty("BASE_URL")).thenReturn("https://api.deepseek.com");
         when(environment.getProperty("API_KEY")).thenReturn("env-api-key");
-        when(environment.getProperty("MODEL")).thenReturn("deepseek-chat");
+        when(environment.getProperty("MODEL")).thenReturn("deepseek-v4-flash");
 
         Map<String, String> configs = configService.getAiConfigs();
 
         assertThat(configs)
                 .containsEntry("BASE_URL", "https://api.deepseek.com")
                 .containsEntry("API_KEY", "env-api-key")
-                .containsEntry("MODEL", "deepseek-chat");
+                .containsEntry("MODEL", "deepseek-v4-flash");
     }
 
     @Test