diff --git a/app.py b/app.py
index b0d579d..6eb41fa 100644
--- a/app.py
+++ b/app.py
@@ -54,21 +54,35 @@ def write_to_csv(data, project):
     """
     csv_file_path = get_csv_file_path(project)
     file_exists = os.path.isfile(csv_file_path)
-    with open(csv_file_path, mode="a", newline="", encoding="utf-8") as csvfile:
-        fieldnames = [
-            "time",
-            "id",
-            "name",
-            "score",
-            "running_time",
-            "details",
-            "project",
-        ]
+
+    fieldnames = ["time", "id", "name", "score", "running_time", "details", "project"]
+
+    existing_data = []
+
+    # 文件存在，先保存
+    if file_exists:
+        with open(csv_file_path, mode="r", newline="", encoding="utf-8") as csvfile:
+            reader = csv.DictReader(csvfile)
+            fieldnames = reader.fieldnames  # 获取原表头
+            existing_data = list(reader)  # 读数据
+
+    # 扩展表头
+    for field in data.keys():
+        if field not in fieldnames:
+            fieldnames.append(field)
+
+    # 重写
+    with open(csv_file_path, mode="w", newline="", encoding="utf-8") as csvfile:
         writer = csv.DictWriter(csvfile, fieldnames=fieldnames)
 
-        if not file_exists:
-            writer.writeheader()
+        # 写表头
+        writer.writeheader()
 
+        # 写回数据
+        if existing_data:
+            writer.writerows(existing_data)
+
+        # 写新数据
         writer.writerow(data)
 
 
diff --git a/public/challenge/knn/main.py b/public/challenge/knn/main.py
index 570d737..078b6d7 100755
--- a/public/challenge/knn/main.py
+++ b/public/challenge/knn/main.py
@@ -1,6 +1,8 @@
 import importlib.util
 import numpy as np
+import os
 import requests
+import subprocess
 import time
 import traceback
 
@@ -19,6 +21,24 @@ def load_user_function(file_path, function_name):
     return getattr(user_code, function_name)
 
 
+def get_commit_hash_url():
+    """
+    获取最新的提交哈希值
+    """
+    try:
+        commit_hash = (
+            subprocess.check_output(["git", "rev-parse", "HEAD"])
+            .strip()
+            .decode("utf-8")
+        )
+        path = os.getcwd().replace("/workspace/", "")
+        url = f"https://git.intcplab.cn/{path}/commit/{commit_hash}"
+        return url
+    except subprocess.CalledProcessError as e:
+        print(f"Error: {e}")
+        return None
+
+
 def evaluate_knn(
     user_func, train_data, train_labels, test_data, test_labels, log_details
 ):
@@ -101,6 +121,7 @@ def upload_score(name, id, score_data):
                 ),
                 "details": score_data["details"],
                 "project": PROJECT_NAME,
+                "hash": get_commit_hash_url(),
             },
         )
         if response.status_code == 200:
diff --git a/public/experiment/knn/main.py b/public/experiment/knn/main.py
index 1dddb23..e685a79 100644
--- a/public/experiment/knn/main.py
+++ b/public/experiment/knn/main.py
@@ -1,6 +1,7 @@
 import importlib.util
-import numpy as np
+import os
 import requests
+import subprocess
 import time
 import traceback
 
@@ -19,6 +20,24 @@ def load_user_function(file_path, function_name):
     return getattr(user_code, function_name)
 
 
+def get_commit_hash_url():
+    """
+    获取最新的提交哈希值
+    """
+    try:
+        commit_hash = (
+            subprocess.check_output(["git", "rev-parse", "HEAD"])
+            .strip()
+            .decode("utf-8")
+        )
+        path = os.getcwd().replace("/workspace/", "")
+        url = f"https://git.intcplab.cn/{path}/commit/{commit_hash}"
+        return url
+    except subprocess.CalledProcessError as e:
+        print(f"Error: {e}")
+        return None
+
+
 def evaluate_knn(
     user_func, train_data, train_labels, test_data, test_labels, log_details
 ):
@@ -101,6 +120,7 @@ def upload_score(name, id, score_data):
                 ),
                 "details": score_data["details"],
                 "project": PROJECT_NAME,
+                "hash": get_commit_hash_url(),
             },
         )
         if response.status_code == 200: