Abstract: With the rapid development of urban transportation construction,there is an increase in the number of subway tunnel;meanwhile,more and more unfavorable engineering geological problems appear during  tunnel construction.Monitoring measurement,as one significant means to ensure security,optimize design,guide construction,its technological progress exerts a vital influence on unfavorable geology’s tunnel construction.Considering the practice of tunnel monitoring in Henggang depot of No.3 subway Shenzhen,this article analyzes construction monitoring data which will be fed back to construction,and summarizes the precautions that need to be paid attention in the monitoring of subway tunnel,all of which plays a reference effect in other similar projects.

Key words: subway, tunnel, unfavorable geology, monitoring measurement, analysis