The characteristic of laser scattering of sea surface is one of the key factors which restrict the laser radar to detect and recognize the artificial flying objects near sea surface. To simulate the state of super-low-altitude and by constructing an artificial indoor tank with wave makers to simulate the real sea surface with diffrient conditions, the data of laser back scattering from the near water surface in typical wave conditions was attained. The sea surface was modelled as a regular grid and the height of grid was derived by using the PM spectrum, the back scattering intensity of each sea surface grid was calculated based on the Torrance-Sparrow model, the back scattering characteristic of the near sea surface irradiated by laser was analysed. The experiment and simulation results are in good agreement with each other and show that, the characteristic of laser back scattering of near sea surface is strongly related with the stochastic distribution of sea waves and its intensity has the performance of the stochastic distribution with the sea surface, the intensity of scattering increases with the increasing of grazing angle. Because of the random fluctuation of sea, the maxium of scattering data fluctuates in a large range and the fluctuation values also increase with the increasing of grazing angle.