Based on the different embedded constraint methods at the beam end of the cantilevered trestle, four model operating conditions are established by using Midas GTS finite element software, and are analyzed and calculated by the strength reduction method provided by the finite element software, which can give the failure modes and safety factors of cantilevered trestle under the different embedded constraint methods at the beam end, and the vertical displacement of the beam under the normal use conditions. Through the analysis and comparison of the calculation results under four operating conditions, the reasonable embedding mode of the beam end is obtained, and the principles of anchor bolt setting length and diagonal brace setting are proposed. And the research results are applied to engineering practice. The rationality of the research conclusion is demonstrated through the implementation of the project case. In view of the fact that there is no special provision for cantilevered trestle in the current code, some suggestions for engineering design are put forward according to the relevant safety factors in Code for Design of Building Slope Engineering.