Force transmission triangular box as the bracing’s bracket is widely applied in the deep foundation, but its performance was not studied in depth. In order to evaluate the working performance of force transmission triangular box as bracing’s bracket, the paper use the finite element software ANSYS to simulate and analyze its mechanical behavior. The bearing capacity, deformation and stress distribution of the components were discussed and compared with the result from elastic bending theory of small deflections of its end-plate deflection. The dangerous sections of member and the inner force distribution in the general work load status were obtained. And the stress concentration was improved. the results can provide reference for the design and construction.