Optimization of the parameters of helical strake on Spar platform was conducted based on or-thogonal design theory. Several parameters that influence the transverse force coefficient of Spar platform were studied by solving RANS equations. The calculation results were processed by using ‘analysis of range’ and ‘analysis of variance’ method to obtain the VIM suppression effect with different parameters of helical strake. A method of optimal selection of helical strake on Spar platform was established.%螺旋侧板能够有效抑制Spar平台涡激运动，为选取较优的螺旋侧板参数，文章基于正交设计理论，采用数值计算方法求解RANS方程，研究侧板螺距比、侧板高度和来流速度等因素对Spar平台横向力系数的影响。采用极差分析法和方差分析法处理计算数据，得到各Spar平台螺旋侧板参数及其交互作用对减涡效果的影响程度。
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