Abstract: Response frequency and response stress of soil around No.2 subway subway tunnel are monitored when the No.2 subway train transit the tunnel. Cycle triaxial test of saturated soft clay around the No.2 subway tunnel is conducted using the data-monitored. Characteristic of deformation of sasturated soft clay due to subway travelling load is analyzed.The results show that when the No.2 subway train begin to run, small and vertical rebound first occurs in the saturated soft clay in the side wall of tunnel. Although larger deformation don't occur in the saturated soft clay at the side wall of tunnel when No.2 subway train run within period of time, but with the process of time, considerable and asymmetrical subsicence will still occurs.Vertical rebound is transitory and plastic deformation occurs immediately in saturated soft clay in the bottom of tunnel, the larger deformation will occur and the deformation of saturated soft clay in the bottom of tunnel is 30 times than that of saturated soft clay in the side wall of tunnel.