diff --git a/unipay/providers/transfer.py b/unipay/providers/transfer.py
index 069d5f6..0b84a54 100644
--- a/unipay/providers/transfer.py
+++ b/unipay/providers/transfer.py
@@ -7,6 +7,7 @@ import poplib
 from appPublic.log import debug, exception
 from appPublic.dictObject import DictObject
 from appPublic.timeUtils import curDateString, timestampstr
+from ahserver.serverenv import ServerEnv
 from email.parser import Parser
 from email.header import decode_header
 from email.utils import parseaddr
@@ -142,7 +143,7 @@ class TransferGateway(Gateway):
 
 	async def run(self):
 		"""后台轮询邮箱，匹配转账码并完成充值入账"""
-		from ahserver.serverenv import ServerEnv
+		debug(f'mail check loop will starting')
 		self.running = True
 		while self.running:
 			debug(f'mail check loop running')