diff --git a/api/services/__pycache__/prompt_service.cpython-312.pyc b/api/services/__pycache__/prompt_service.cpython-312.pyc
index 9081add..a997d0c 100644
Binary files a/api/services/__pycache__/prompt_service.cpython-312.pyc and b/api/services/__pycache__/prompt_service.cpython-312.pyc differ
diff --git a/api/services/prompt_service.py b/api/services/prompt_service.py
index 26b1f9c..d514420 100644
--- a/api/services/prompt_service.py
+++ b/api/services/prompt_service.py
@@ -17,6 +17,7 @@ from typing import Dict, Any, Optional, List, cast
 from pathlib import Path
 import mysql.connector
 from mysql.connector import pooling
+import random
 
 from core.config import ConfigManager, ResourceConfig
 from utils.prompts import BasePromptBuilder, PromptTemplate
@@ -341,10 +342,15 @@ class PromptService:
                     full_path = self._get_full_path(path_str)
                     
                     if full_path.exists() and full_path.is_file():
-                        content = full_path.read_text('utf-8')
-                        refer_content += f"--- {full_path.name} ---\n{content}\n\n"
+                        with open(full_path, 'r', encoding='utf-8') as f:
+                            lines = f.readlines()
+                        if lines:
+                            sample_size = max(1, int(len(lines) * ref_item.sampling_rate))
+                            sampled_lines = random.sample(lines, sample_size)
+                            sampled_content = ''.join(sampled_lines)
+                            refer_content += f"--- {full_path.name} (sampled {ref_item.sampling_rate * 100}%) ---\n{sampled_content}\n\n"
                 except Exception as e:
-                    logger.error(f"读取参考文件失败 {ref_item.path}: {e}")
+                    logger.error(f"读取或采样参考文件失败 {ref_item.path}: {e}")
         except Exception as e:
             logger.error(f"获取参考内容失败: {e}")