According to the problem of three dimensional shape reconstruction of strongly reflected metal surface, based on the traditional light illuminance bidirectional reflectance distribution function (BRDF) model, the Cook-Torrance reflection model is researched in detail. And the phase shift characteristics of the metal surface are analyzed with Fresnel formula. Taking the complex refractive index of some common metal in visible light region as an example, the specular reflectivity and phase shift characteristic curves of common metal at different wavelength are obtained through model simulation, which provides theoretical basis and methodological guidance for 3D shape reconstruction measurement application of the metal surface object.