The raw water pipeline of Shanghai Lingang Waterworks inevitably causes the stress relief and redistribution of stratum soil mass in the construction of crossing the embankment of Dazhi River. The pipe jacking and foundation pit construction will inevitably affect the safety of Dazhi River embankment. From the perspective of view of protecting the embankment safety of Dazhi River, the finite element analysis method is used to carry out the in-depth theoretical analysis, study and demonstrate the impact of construction on the embankment safety of Dazhi River under the conditions of foundation pit construction, pipe jacking construction and cofferdam construction, and put forward the relevant suggestions for reducing the impact in order to provide the effective support for ensuring the structural safety of Dazhi River embankment. The research shows that the deformation of Dazhi River embankment caused by the foundation pit construction of manhole is within the allowable range and has little influence on the current structure.