To ensure commercial car transportation safety, avoid the contact of commercial car and special railway vehicle, a method of restoring commercial car motion attitude was designed, which was motivated by the transportation needs of commercial cars loaded in special railway vehicle. This method can obtain the maximum longitudinal and transverse dynamic displacements of commercial car in railway impact test based on the data of displacement sensors. Firstly, a model was established to describe the position relationship of points marked on commercial car. Secondly, the numerical solution of the model was obtained by Newton method. Finally, the translational and rotational transfer matrixes were deduced. The coordinates of points on commercial car can be obtained by using the translational and rotational transfer matrixes. Furthermore, based on the commercial car dangerous points, the maximum longitudinal and transverse dynamic displacements of commercial car can be got.
 

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