Freak wave is a kind of accidental wave in the sea with short duration but great harm, so that the re-search on the generation and evolution of freak wave has important practical significance. In this paper, based on the direc-tion of the spectrum and improved phase modulation method, a numerical simulation method of short-peak freak waves was proposed, which increased the probability of freak wave and realized to generate freak waves in predetermined time and place, and in the Matbab language environment to achieve the numerical simulation. Simulation results show that the result of spectral analysis had good agreement with target spectrum though the maximum entropy method.%畸形波是海洋中存在的偶然性大波，其持续时间短但危害性极大，研究畸形波的生成及演化规律有重要的现实意义。基于方向谱，通过改进的相位调制方法，提出一种短峰畸形波的数值模拟方法，提高畸形波生成的概率，实现定时定点生成畸形波，并在 Matbab 语言环境实现数值仿真。仿真结果表明：改进的最大熵方法进行谱分析，与目标谱比对证明模拟结果吻合较好。
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