Research conclusions:The rise of the foundation pit，displacement of protected wall，anchor cable engineering，precipitation and untimely support the pits in foundation pit are the major reasons for producing the big settlement and deformation of the surrounding ground． and the anchor cable engineering has the biggest influence． However，the SMW process pile and anchor support system are available for Hangzhou area，but if there is a protected buildings near the pit，the influence of the anchor system should be controlled strictly to reduce the disturbance of the soil and control the deformation．