Rough sea surface polarization characteristics have great influence on target detection and recognition in sea scene. In order to studying on infrared polarization of sea surface in different wind speeds and detecting angles,the long wave infrared polarization calculation model is derived based on the bidirectional reflectance distribution function and Fresnel′s law of reflection. The sea surface model is established based on wave spectrum and fast Fourier transform. Combined with the measured data of Chinese stations,the radiance of seawater and the radiance of sky and atmosphere are calculated. The polarization characteristics of sea surface in long wavelength infrared band under different wind speed are analyzed. The simulation results show that the distribution of the incident angle of each micro element extends to both sides almost symmetrically,so that the peak polarization degree decreases and the corresponding detection angle decreases,with the increase of wind speed. When the detection angle is less than 63°,the degree of polarization increases with the increase of wind speed；when the detection angle is greater than 63°,the degree of polarization decreases with the increase of wind speed；when the detection angle is 63°,the polarization degree of sea surface is almost unaffected by wind speed. The results have some guiding significance for infrared polarization detection in sea surface scene.