Taking Caojiawang station in chongqing for example,vault crown settlement and peripheral convergence of tunnel were monitored,and the monitoring data was processed by using logarithmic function fitting,it was predicted that the final value of the tunnel vault subsidence is 11 mm and the peripheral convergence of the tunnel is 8 mm,The stability criterion of surrounding rock was adopted to regression analysis on monitoring data,the tunnel surrounding rock was in a safe state,so monitoring data was processed,variation of stability of surrounding rock was mastered.