Abstract: Based on the requirements of high fatigue strength of connecting rod and fracture splitting process, a powder-forged bimaterial connecting rod was proposed. The microstructure and fatigue properties of the big end, rod of the powder-forged bimaterial connecting rod were analyzed by metallographic examination, scanning electron microscope and fatigue test. The results show that the microstructure of the big end and the rod were composed of pearlite, ferrite and nano copper rich phase, and the rod material had more and larger nano copper rich phases. The average fatigue strength and fatigue limit of the rod material were greater than that of the big end material, and the fatigue performance of the rod was further improved after shot peening. The MnS in big end material promoted fatigue crack expansion, which could reduce the fatigue strength, while shot peening could strengthen the surface layer of the rod material and improve its fatigue resistance.