Research conclusions :(1) In view of the larger excavations of soft soil area，according to the requirements of the lateral wall of the excavations with different control，we formulate the scheme of row pile of displacement control combined with vertical inclined supporting and sloping of stability control with cantilever pile，the reasonable conclusion was verified by the monitoring data which can be used for reference of similar projects. (2) In the process of excavations design，we should pay attention to the actual situation of the side wall of excavations，and use existing reinforcement measures to improve the geotechnical parameters reasonably，to save engineering investment and shorten the time limit. ( 3 ) During the construction，the overload of the excavations should be strictly controlled，the deformation quantity of the excavations should be in the allowable range，and the risk of excavations accidents should be reduced. (4) The research results can provide guidance for the design and construction of deep excavation in soft soil area.