Based on the deep foundation pit project of No. 3 section in 1st section of Laiwu to Linyi section in Beijing-Shanghai Expressway Reconstruction and Expansion Project, this paper used multi-objective level analysis and fuzzy comprehensive evaluation method to select the suitable support form for this project. Combined with on-site monitoring and numerical simulation, the mechanic and deformation characteristic of soil and supporting structure during the foundation pit construction of are analyzed under using supporting form. The research result show that the multi-objective fuzzy comprehensive evaluation method based on multi-objective AHP was used to establish a multi-index evaluation system, and upper 1: 1 slope + soil nail support method was determined. (2) The surface settlement decreased first and then increased with increase of distance from foundation pit. The bite pile can better control slope deformation well. (3) The maximum displacement position of bite pile body gradually moved down with the excavation, and the ratio of two vertical displacements is equal to the thickness ratio of adjacent soil layer. (4) Comparing the result of on-site monitoring result with finite element analysis data, the reliability of numerical simulation and multi-index evaluation system was verified.