The railage plays very important role in the traffic transport of our country, and has great effect on our country economy. Because the assembly locomotive wheel which is widely used in our country may cause the digression and subversion accident because of the rim relaxation, which badly affects the safety of the railage, this article brings forward the method that adds a safety retaining ring to the rim of the assembly locomotive wheel, which can effectively prevent the serious accident such as locomotive digression, subversion caused by the rim relaxation.The change that adds retaining ring to the locomotive wheel will influence the moving wheel on the stress and its distribution of the assembling wheel, the dynamics characteristics of the wheel, the safety border of the rim tread and flange of the wheel, the temperature and stress field, etc. So it is necessary to analyze the mechanics behaviour of the locomotive wheel added the retaining ring, so that we can supply the theory proof to the safety usage of the locomotive. At the basis of the analysis to the relationship of the reciprocity of the wheel and rail system, it studies the mechanics behaviour of the locomotive wheel added the retaining ring. The research includes:(1) For the locomotive digression and subversion problem caused by the rim relaxation of the assembly locomotive wheel, bringing forward the method that adds the retaining ring to the inside of the rim, which can effectively prevent the locomotive digression and subversion.(2) Researching the statics and dynamics of the locomotive wheel added retaining ring. The research result shows that the presence of the retaining ring trough has some effect to the statics and dynamics, but the effect is local and does not cause the change of the quality. It proves, from theory, that the locomotive wheel can run safely after adding the retaining ring.(3) Analysing the alignment evolvement of the locomotive wheel tread and the character of wearing tread, giving the uniformity wear suppose of the wheel tyre tread. Building the optimization model by the suppose to quest the theory high-point borderline of the adding retaining ring wheel. The research shows that the forbidden limit which is prescribed in the technology criterion by the Railway Department is until safe and applicable to the locomotive wheel added the retaining ring.(4) Researching the mechanics behaviour of the locomotive wheel added the