Based protection scheme of longitudinal impact of the excavation on the adjacent tunnel in soft soil,the influence of foundation pit excavation beng adjacent to tunnel on longitudinal displacement and moment was systematically analyzed by using ABAQUS.Three shaft stirring pile was taken as protection scheme sensitivity by making comparisons between strength and depth of reinforcement. After comparison, it is found that the longitudinal displacement decreased obviously with increasing of reinforcement intension, and restriction effect decreased obviously when the longitudinal displacement reached certain value. The increase of reinforcement intension had little weaker effect on the longitudinal section monment. The reinforcement depth had obvious effect on the distortion of tunnel, but the big reinforcement depth was not optimal. The diaphragm wall and the passive soil reinforcement had blocking effect on the displacement caused by foundation pit excavation being adjacent to tunnel.In this study, the optimal reinforcement intension was 200 MPa and the reinforcement depth was 6 m, which can have good effect on the tunnel distortion and reach the good economical benefit.