diff --git a/debug/accuracy_tools/api_accuracy_checker/common/utils.py b/debug/accuracy_tools/api_accuracy_checker/common/utils.py
index 4d9db1aeccd6875472b14ec5e1fa4cd4a3488530..a6241ea9bad3cd4a1c73b054b49ebe83f8e16e0b 100644
--- a/debug/accuracy_tools/api_accuracy_checker/common/utils.py
+++ b/debug/accuracy_tools/api_accuracy_checker/common/utils.py
@@ -187,8 +187,9 @@ def read_json(file):
     return obj
 
 def write_csv(data, filepath):
-    data_frame = pd.DataFrame(columns=data)
-    data_frame.to_csv(filepath, index=False)
+    with open(filepath, 'a') as f:
+        writer = csv.writer(f)
+        writer.writerows(data)
 
 def _print_log(level, msg):
     current_time = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(int(time.time())))
diff --git a/debug/accuracy_tools/api_accuracy_checker/compare/compare.py b/debug/accuracy_tools/api_accuracy_checker/compare/compare.py
index c5ae3729947ed75eaefe439b3d9a2fd6c243ef1b..f57a8a96c1a475c308031bf276579dc60747774c 100644
--- a/debug/accuracy_tools/api_accuracy_checker/compare/compare.py
+++ b/debug/accuracy_tools/api_accuracy_checker/compare/compare.py
@@ -10,6 +10,7 @@ from api_accuracy_checker.compare.compare_utils import CompareConst
 class Comparator:
     TEST_FILE_NAME = "pretest_result.csv"
     DETAIL_TEST_FILE_NAME = "pretest_details.csv"
+
     # consts for result csv 
     COLUMN_API_NAME = "API name"
     COLUMN_FORWARD_SUCCESS = "Forward Test Success"
@@ -29,11 +30,12 @@ class Comparator:
         self.register_compare_algorithm("Thousandth Relative Error Ratio", get_rel_err_ratio_thousandth, None)
         self.register_compare_algorithm("Ten Thousandth Relative Error Ratio", get_rel_err_ratio_ten_thousandth, None)
         self.register_compare_algorithm("Default: isEqual", compare_builtin_type, None)
-        self.test_results = []
+
         self.test_result_cnt = {
             "forward_fail_num": 0, "backward_fail_num": 0, "forward_and_backward_fail_num": 0, "success_num": 0
         }
         self.result_save_path = result_save_path
+        self.write_csv_title()
 
     def print_pretest_result(self):
         res_dict = {
@@ -48,25 +50,13 @@ class Comparator:
         info_tb = str(tb)
         print_info_log(info_tb)
 
-    def write_compare_csv(self):
-        self.write_summary_csv()
-        self.write_detail_csv()
+    
 
-    def write_summary_csv(self):
-        test_rows = [[self.COLUMN_API_NAME, self.COLUMN_FORWARD_SUCCESS, self.COLUMN_BACKWARD_SUCCESS]]
-        if self.stack_info:
-            test_rows[0].append(self.COLUMN_STACK_INFO)
-        for result in self.test_results:
-            name = result[0]
-            df_row = list(result[:3])
-            if self.stack_info:
-                stack_info = "\n".join(self.stack_info[name])
-                df_row.append(stack_info)
-            test_rows.append(df_row)
-        write_csv(test_rows, self.save_path)
+    def write_csv_title(self):
+        summary_test_rows = [[self.COLUMN_API_NAME, self.COLUMN_FORWARD_SUCCESS, self.COLUMN_BACKWARD_SUCCESS]]
+        write_csv(summary_test_rows, self.save_path)
 
-    def write_detail_csv(self):
-        test_rows = [[
+        detail_test_rows = [[
             "Subject", "Bench Dtype", "NPU Dtype",
             "Cosine Similarity", "Cosine Similarity Message",
             "Max Rel Error", "Max Rel Err Message",
@@ -75,23 +65,42 @@ class Comparator:
             "Compare Builtin Type", "Builtin Type Message",
             "Pass"
         ]]  
-        for test_result in self.test_results:
-            subject_prefix = test_result[0]
-            fwd_result = test_result[3]
-            bwd_result = test_result[4]
-            if isinstance(fwd_result, list):
-                for i, test_subject in enumerate(fwd_result):
-                    subject = subject_prefix + ".forward.output." + str(i)
-                    test_rows.append([subject] + list(test_subject))
-            if isinstance(bwd_result, list):
-                for i, test_subject in enumerate(bwd_result):
-                    subject = subject_prefix + ".backward.output." + str(i)
-                    test_rows.append([subject] + list(test_subject))
+        write_csv(detail_test_rows, self.detail_save_path)
+
+    def write_summary_csv(self, test_result):
+        test_rows = []
+        if self.stack_info:
+            test_rows[0].append(self.COLUMN_STACK_INFO)
+
+        name = test_result[0]
+        df_row = list(test_result[:3])
+        if self.stack_info:
+            stack_info = "\n".join(self.stack_info[name])
+            df_row.append(stack_info)
+        test_rows.append(df_row)
+        write_csv(test_rows, self.save_path)
+
+    def write_detail_csv(self, test_result):
+        test_rows = []
+
+        subject_prefix = test_result[0]
+        fwd_result = test_result[3]
+        bwd_result = test_result[4]
+        if isinstance(fwd_result, list):
+            for i, test_subject in enumerate(fwd_result):
+                subject = subject_prefix + ".forward.output." + str(i)
+                test_rows.append([subject] + list(test_subject))
+        if isinstance(bwd_result, list):
+            for i, test_subject in enumerate(bwd_result):
+                subject = subject_prefix + ".backward.output." + str(i)
+                test_rows.append([subject] + list(test_subject))
 
         write_csv(test_rows, self.detail_save_path)
 
     def record_results(self, *args):
-        self.test_results.append(args)
+        self.write_summary_csv(args)
+        self.write_detail_csv(args)
+
 
     def register_compare_algorithm(self, name, compare_func, standard):
         self.compare_alg.update({name: (compare_func, standard)})
diff --git a/debug/accuracy_tools/api_accuracy_checker/run_ut/run_ut.py b/debug/accuracy_tools/api_accuracy_checker/run_ut/run_ut.py
index e5737b511068814d85ffb3d3eb5654288a46c93f..7fcb0dbd96fa0c82f46f6c28b123092a750e8f77 100644
--- a/debug/accuracy_tools/api_accuracy_checker/run_ut/run_ut.py
+++ b/debug/accuracy_tools/api_accuracy_checker/run_ut/run_ut.py
@@ -86,7 +86,6 @@ def run_ut(forward_file, backward_file, out_path, save_error_data):
                 print_error_log(f"Run {api_full_name} UT Error: %s" % str(err))
 
     compare.print_pretest_result()
-    compare.write_compare_csv()
 
 
 def run_torch_api(api_full_name, api_setting_dict, backward_content, api_info_dict):