Abstract: For an independent wheel bogie with offset center plate structure, the vehicle body force analysis model for two-module tram passing curve is established, and quasi-static equilibrium equation is obtained. With transverse mechanical equations, the relationship between wheelset lateral force and center plate offset distance is derived and the accuracy is verified by dynamics simulation. According to wheelset lateral force standards, the concept of wheelset lateral force evaluation index is proposed. Based on the principle of minimum wheelset lateral force evaluation index, the critical offset distance of the center plate is derived. The dynamics performance of different offset distances of center plate state is analyzed. Simulation results show that when center plate is at critical offset distance, tram passing curve performance is improved to certain extent; when center plate is offset over critical value, tram passing curve performance falls notably.