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建立规则波作用下垂荡浮筒三维水动力数学模型,并与规则波理论解以及他人的垂荡浮子试验数据进行有效验证.利用验证后的模型对不同密度的圆柱形浮筒垂荡行为进行计算分析,发现:1)密度较小的浮筒位移曲线靠上,密度较大的位移曲线靠下.密度越大,浮筒下降运动的时间越短,下降运动时间小于上升运动时间.2)随密度的增加,浮筒最大垂荡速度减小,最大上升速度和下降速度的差值也相应减小.3)随着密度的增加,浮筒受到的垂向合力和浮筒动能相应增加,波浪透射系数下降.,A 3-D hydrodynamic mathematical model of heaving buoy affected by regular wave was established ,and was validated effectively by regular wave theory and other experiment data of heaving buoy. The heaving behavior of cylindrical buoy with different densities was analyzed by utilizing the validated model. It is found that 1)The displacement curve of buoy with lower density is higher than that with high density. The falling movement period of buoy decreases with increasing density,and the falling movement period of buoy is less than its rising movement period. 2)With the increase of buoy’s density,the maximum value of heaving speed decreases,and the difference between maximum value of rising speed and maximum value of falling speed decreases;3)With increasing density of buoy,vertical resultant force and kinetic energy of buoy increase,respectively,however the wave transmission coefficient decreases.