Research conclusions: For the protection of adjacent subway tunnel which the accessional settlement of the tunnel induced by the excavation can not exceed 20mm． Considering the protection of adjacent Shanghai No． 2 tunnels of N0．1788 of west Nanjing road，many special measurements were applied to the designing of pit project． Including the proposal of down － up method with zoned construction with a temporary diaphragm wall inside the excavation engineering，prediction the accessional deformation of tunnels by numerical analysis and detailed in situ monitoring of the pit and tunnels during excavation． According to the in situ monitoring data，The protection of the adjacent tunnels is successful and it testified the validity of the designing and construction of the excavation engineering in soft soil．