Abstract: To address the problem of realistically rendering diffraction effects in computer graphics, this paper proposes a physically rendering method based on the microfacet diffraction model.This method incorporates the strengths in current diffraction rendering models, and combines the variable Fresnel coefficient of the specific material to augment diffraction effect;takes into account the absorption of photons, shadowing or masking of microfacets and interreflection in the interest of extending the applicable scopes of the height field microfacet;incorporates Wigner distribution function to defer the diffraction effects in order to further augment the microfacet model.Based on the geometrical optics theory, Monte Carlo sampling theory is used to solve the wave equation integral for the spatial distribution of the radiance on microfacets.Finally, a bidirectional reflectance distribution function diffraction optics model based on the light's wave equation is constructed, which can be applied to the ray-tracer.The experimental results demonstrate that our method can efficiently model the phase and amplitude of the wave to generate high-quality realistic diffraction effects, reducing the computational complexity of the wave equation.