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Deflexion-angle is a crucial parameter for automobile controlling stability and safety. For constructing the basement of deflexion-angle detection, the model of semi-trailer train's suspension is built and leaf spring dependent suspension is replaced with helical spring dependent suspension in the model. Balance suspension is adopted to distribute axle load uniformly. The mainly measuring parameters of stable steering performance including tractor speed, tractor's lateral acceleration and semi-trailer train's folding angle are also tested in the experiment. Comparison of experiment and simulation results show that there is consistency between the stable steering performance of established semi-trailer train's model and real vehicle, and we can perform reliable analysis and research by the established semi-trailer train's model.