In order to study the effects atmosphere transmission on the laser beam intensity distribution at sea, a model of laser beam intensity distribution on reaching face is established based on the example of Hermits-Gaussian (H-G)s. According to the generalized Huygens-Fresnel principle, the peculiarity of laser beam intensity distribution is simulated under the different condition such as refractive index of atmospheric structure constant and transmission pace and laser wavelength. The result indicated: if the parameters of effect and beam is confirmed，the peculiarity of laser beam intensity distribution in far field can be determined.