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The influence of TiB2 on the fatigue properties of Al-Si-Cu series alloys was discussed with the help of finite element simulation, and the feasibility of the spatial configuration distribution of the reinforcement to solve the problem of inversion of the strength and toughness of the particle reinforced metal matrix composites was verified, and the test efficiency was effectively improved. In this paper, the different content and distribution characteristics of TiB2 particles are introduced into the two-dimensional geometric model of Al-Si-Cu alloy materials through configuration design methods, and the influence of TiB2 particles on the stress amplitude and fatigue limit distribution of aluminum matrix composites under fatigue conditions is discussed with the help of computer finite element simulation technology. The results show that with the increase of TiB2 particle content, the stress amplitude first decreases and then increases. The minimum value at a particle content of 3% is reduced by 12% compared to no addition. The fatigue limit showed a trend of gradual increase, reaching a maximum at 5% TiB2 content, an increase of 55.9% year-on-year. With the increase of TiB2 agglomeration, the stress amplitude showed an overall trend of increase. The fatigue limit shows a trend of gradual reduction. Combined with the simulation results of fatigue stress amplitude and fatigue limit simulation, it is estimated that when the TiB2 particle content is 3%, the strength, toughness, fatigue strength, tensile strength and yield strength of the material reach the optimal state. This result provides some technical support for the design of TiB2 particle-reinforced aluminum matrix composites. [ABSTRACT FROM AUTHOR]