Abstract: In light of the laser scattering field model of the rough sea surface is not suitable for laser beam grazing incidence and ignores the influence of wind speed, based on the Cox-Munk and kirchhoff approximation(KA) simulation model of anisotropic rough sea, directional reflectance ratio distribution model for grazing incidence laser beam was set up, change law of directional reflectance ratio vs wind speed, wind direction, incident angle, incident position angle, reflection angle, reflection position angle was simulated, and the result was verified by pool experiments. Results show that the laser energy scattering of rough sea surface mainly distributes in the conical space angular which in order to irradiated surface for a vertex, this space angular direction locates near the specular reflection direction, as the wind speed increases, space angular becomes larger, for grazing incidence laser beam, due to the shielding effect, the direction of space angular away from the specular direction. The model can provide certain theoretical basis for the research of semi-active laser guided missile shooting small targets at sea and layout of laser decoy in rough sea.