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This work focuses on the optimizing design of the bolt joint of the steel-aluminum body frame of an electric bus. First, a finite element (FE) model is established for the T-joint part of the bus body frame and nonlinear quasi-static analysis is carried out by HyperWorks to understand the effect of the structural parameters of the bolt joint on the concerned performance such as strength and stiffness. Five design variables those are bolt diameter, center distance between the bolts, the thickness of the connecting part, the area of the ribbed plate of the connecting part and the thickness of the connected aluminum part are introduced for optimizing. The maximum deformation and the maximum stress of the joint are chosen as the indicators. Then the function relations between the performance indicators and the design variables are formulated by the polynomial regression analysis method with the data obtained from 25 groups of orthogonal experiment.