In order to research the effect of tall buildings and public service on supporting structures of deep foundation pit, the paper studied the influence of surrounding building loads on supporting structure stability of deep foundation pit by taking the deep foundation pit project of Asian Finance Building in Shenyang as the research object. It also researched the change law of vertical and horizontal displacement of supporting structures of deep foundation pit by means of field monitoring and verified the effectiveness of its supporting structure. The supporting structures of deep foundation pit were simulated many times by using finite element analysis software MIDAS/GTS and the relationship between parameters and deformation of supporting structures was summed up by changing the distance from the building etc. The research results show that the deformation of deep foundation has significantly increased when there are buildings around the foundation; the deformation value of the deep foundation pit increased linearly with the increase of buildings force surrounding deep foundation pit ; The impact of building distance on the deep foundation pit was increased power series in 2 times depth of excavation. The impact of fine and high building on deep foundation pit is larger than that of chunky building. The result can offer some guiding significance for optimization of supporting structural scheme of foundation pit.