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对激光水下目标探测中海水对光束的空间和角度扩散进行了深入研究。模拟得到的水下光斑半径的分布曲线与国外的研究结果相吻合。通过模拟给出了水面光斑半径的分布曲线和水面光斑内目标反射光子出射角度的分布曲线。对海面上的海浪和泡沫对光束扩散的影响进行了模拟研究，证明了此影响在风速小于１４ｍ／ｓ时可以忽略。
In the laser underwater target detection, the seawater has deeply studied the spatial and angular diffusion of the light beam. The distribution curve of the underwater spot radius simulated by the simulation is consistent with the foreign research results. The distribution curve of the spot radius of water surface and the distribution curve of the exit angle of the target reflected photons in the water spot are given by simulation. The effects of waves and bubbles on the beam diffusion on the sea surface are simulated and it is proved that this effect can be neglected when the wind speed is less than 14m / s.