The mechanical parameters of composite materials with inclusion particles are important in engineering. Based on the computational homogenization method and the random periodic composite material model generation algorithm, a method was proposed to calculate the elastic modulus of the composite material with inclusion particles from representative elementary volume, and the influence of the distribution, size and content of the inclusion particles on the mechanical parameters of the composite material was studied. The composites show isotropy when the particles are randomly distributed and anisotropy when the particles are distributed along a certain direction. The mechanical parameters of composites become stable with the increase of element size. The elastic modulus increases with the increase of particle content, and poisson's ratio decreases with the increase of particle content. The results show that the calculation of homogenization is an effective method to study the mechanical parameters of composite materials.