To enhance the efficiency of ocean color remote sense technology,the 3D characteristics of laser diffusion from water surface in different sea conditions and different incident angles were modeling and simulated,and energy distribution characteristics of scattered field after laser incidence were studied in the laboratory. Firstly,the coupling relationships among components in different directions were analyzed and the corresponding matrix equations were obtained with Maxwell equations and boundary conditions. Secondly,the 3D model of incident laser beam was established with 3D tapered wave. Finally,the 3D BSC was gotted and was verified by experiments. The results show that this method can accurately express the characteristics of laser diffusion from water surface.