diff --git a/PyPtt/PTT.py b/PyPtt/PTT.py
index 1076ca79..35ba8220 100644
--- a/PyPtt/PTT.py
+++ b/PyPtt/PTT.py
@@ -99,7 +99,6 @@ def __init__(self, **kwargs):
 
         self.config.language = language
 
-        print('language', self.config.language)
         i18n.init(self.config.language)
 
         self.is_mailbox_full: bool = False
diff --git a/PyPtt/_api_util.py b/PyPtt/_api_util.py
index 59ddeab0..2cc810fb 100644
--- a/PyPtt/_api_util.py
+++ b/PyPtt/_api_util.py
@@ -218,8 +218,8 @@ def parse_query_post(api, ori_screen):
         cursor_line = [line for line in ori_screen.split(
             '\n') if line.strip().startswith(api.cursor)][0]
     except Exception as e:
-        print(api.cursor)
-        print(ori_screen)
+        log.logger.debug('cursor', api.cursor)
+        log.logger.debug('ori_screen', ori_screen)
         raise e
 
     post_author = cursor_line
diff --git a/PyPtt/connect_core.py b/PyPtt/connect_core.py
index a4abaa26..6ac973bd 100644
--- a/PyPtt/connect_core.py
+++ b/PyPtt/connect_core.py
@@ -185,7 +185,7 @@ def _wait():
                 connect_success = True
             except Exception as e:
                 traceback.print_tb(e.__traceback__)
-                print(e)
+                log.logger.debug(str(e))
 
                 if self.config.host == data_type.HOST.PTT1:
                     log.logger.info(i18n.connect, i18n.PTT, i18n.fail)
@@ -286,7 +286,7 @@ def send(self, msg: str, target_list: list, screen_timeout: int = 0, refresh: bo
                 pass
             except Exception as e:
                 traceback.print_tb(e.__traceback__)
-                print(e)
+                log.logger.debug(str(e))
                 msg = msg.encode('utf-8', 'replace')
 
             if is_secret: