diff --git a/apps/desktop/src-tauri/src/business/services/conversation_service.rs b/apps/desktop/src-tauri/src/business/services/conversation_service.rs
index 3ee7e15..d1561ea 100644
--- a/apps/desktop/src-tauri/src/business/services/conversation_service.rs
+++ b/apps/desktop/src-tauri/src/business/services/conversation_service.rs
@@ -146,14 +146,6 @@ impl ConversationService {
         // 构建contents数组，包含历史消息
         let mut contents = Vec::new();
 
-        // 添加系统提示（如果有）
-        if let Some(system_prompt) = system_prompt {
-            contents.push(ContentPart {
-                role: "system".to_string(),
-                parts: vec![Part::Text { text: system_prompt.to_string() }],
-            });
-        }
-
         // 添加历史消息
         for msg in history_messages {
             let parts = self.convert_message_content_to_parts(&msg.content)?;