通过对不同加工状态下Ｃｒ１２ＭｏＶ钢三角凸轮样品显微组织的观察分析，提出较合理的加工工艺和方法。随后采用化学镀ＮｉＰ对三角凸轮进行表面改性的研究，通过系统的硬度试验和耐磨性对比试验表明：ＮｉＰ化学镀表面改性后，其表面维氏硬度提高４００ＨＶ以上，２ｈ的耐磨性试验后其表面磨损宽度下降１３％以上。可有效提高三角凸轮的使用寿命。还结合耐磨性试验后表面磨损形貌分析，对磨损机理进行了初步探讨。 Through the observation and analysis of the microstructure of Cr12MoV steel cam samples under different processing conditions, a more reasonable processing technology and method are proposed. Subsequently, the electroless Ni-P was used to study the surface modification of the triangular cam. The comparison of the hardness test and wear resistance of the Ni-P electroless plating showed that the surface Vickers hardness of the Ni-P electroless plating increased more than 400 HV, After the wear resistance test its surface wear width decreased by more than 13%. Triangular cam can effectively improve the service life. The abrasion mechanism was also discussed with the analysis of surface wear morphology after abrasion resistance test.