The infrared radiance statistics of natural terrain in a random wind field was analyzed based on the heat balance equation,in which the effects of latent and sensible hea texchanges and atmospheric thermal radiation are under consideration. The results show that the statistics distribution,average value,variance,skewness and kurtosis of radiative temperature of bare terrain vary not only with the average wind speed,but also with the fluctuation of wind. As a result of the latent heat exchange, the average temperature of natural terrain is obviously lower than that of dry bare ground,where there is no latent heat exchange.