Research conclusions:(1)The convergence deformation of sidewalk is 1 .5-2 times as much as that of the arch，and the stability of surrounding rock in deformation of sidewalk takes much more days in the Upper Tertiary water-rich clay tunnel. (2)The deformation of this clay tunnel is influenced by the combined time-spatial effects，and the ratio of deformation produced by the time-effect has hysteretic nature，the big deformation place don't often happened in the tunnel face，but in the back of 15-25 m away from the tunnel face，just to say the sidewalk deformation effect range is 3D-5D("D" means the diameter of tunnel excavating).(3)After excavating the tunnel，using strong initial supports which can offset the effects of time-spatial characteristics，and also can provide enough resistance to offset the surrounding rock deformation before secondary lining construction.(4)The research results can be used widely into design and construction in the same geotechnical clay tunnel.