Research conclusions: Under the effect of the axial compressive loading，the loads beared by the shear connector and the core concrete are proportional to their stiffness． The simulation calculation of the steel － concrete segment should be made according to the different simulation calculation purposes，and by using different models，such as the spring model，the solid model without bond － slip effects and the solid model on considering the failure of concrete with bond －slip effects． This paper presents a novel method for the connection between concrete beam and steel beam， that is to anchor the longitudinal steel bars directly on the end of the bearing plate without the joint segment． This connection structure is simple with the clear load bearing．