diff --git a/src/log_ctrl.py b/src/log_ctrl.py
new file mode 100644
index 0000000..3747f65
--- /dev/null
+++ b/src/log_ctrl.py
@@ -0,0 +1,35 @@
+#!/bin/python
+
+import os
+import glob
+import config
+
+
+def save_run_log():
+    # save_log_[xx]
+    file_list = glob.glob(f'{config.SAVE_LOG_PATH}*')
+    if len(file_list) == 0:
+        os.system(f'cp -rf {config.RUN_LOG_PATH} {config.SAVE_LOG_PATH}_0')
+
+    else:
+        max_idx = 0
+        for v in file_list:
+            idx = int(v.split('_')[-1])
+            if idx > max_idx:
+                max_idx = idx
+
+        os.system(
+            f'cp -rf {config.RUN_LOG_PATH} {config.SAVE_LOG_PATH}_{max_idx+1}')
+
+    os.system(f'echo "" > {config.RUN_LOG_PATH}')
+
+
+def main():
+    if os.path.isfile(config.RUN_LOG_PATH):
+        file_size = os.path.getsize(config.RUN_LOG_PATH)
+        if file_size >= config.RUN_LOG_SIZE_LIMIT:
+            save_run_log()
+
+
+if __name__ == '__main__':
+    main()