According to analysis of geographical location and meteorological data of Colombo port, Sri Lanka, the monsoon influences project sea area was confirmed, and the prevailing wind was NE direction in winter and SW direction in summer. The cyclone was weak when it passed through Sri Lanka island, and no serious disaster influ-ences on the project area. In this paper, the meso scale atmospheric model MM5 was adopted to reappear wind fields in 20 a from 1991 to 2010. Wave conditions at-30 m isobath around Colombo port were calculated by SWAN model using the wind field of MM5 model. The verification between model results and satellite wave values were conducted to optimize the input file of SWAN model. Yearly extreme wave height from 1991 to 2010 was obtained to calculate wave conditions in different return periods by P-Шcurve fitting method.%通过分析斯里兰卡科伦坡港口所处地理位置及气象波浪资料，了解工程海域主要受到季风气候的控制，冬季盛行东北季风，夏季西南季风，热带气旋在经过或影响到斯里兰卡岛时强度较低，风速不是很大，对该区域没有灾害性的影响。文章利用中尺度大气模式MM5模拟历史天气状态，再现1991~2010年20 a的影响工程海域的风场过程。根据得到的风场过程，利用海浪模式SWAN计算科伦坡南港附近海域30 m等深线处各向的波浪要素，并利用卫星观测数据进行结果验证。利用优化后的模型计算了1991~2010年计算方向的波高年极值，P-Ш曲线适线法计算得到不同重现期的外海波要素。
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