Numerical simulation is carried out on the lfow ifeld around a two-dimensional stepped planing boat at different attack angles with different models of step height. The computational results of different models are signiifcantly different, relfecting the inlfuence of the variation of the model parameters on the hydrodynamic characteristics. It analyzes the hydrodynamic mechanism of the step and discusses the strength and the extent of the detached eddy behind the step and the discrepancy of the pressure distribution on the planning surfaces caused by different model parameters.% 利用数值手段对二维断级滑行艇模型的绕流场进行模拟，并针对不同攻角及断级高度的模型进行对比计算。不同模型的计算结果具有明显差异性，能较好表现出模型参数的变化对模型水动力特性的影响。分析断级的作用机理，并论述断级后脱体涡的强度和范围以及模型参数不同而引起的滑行面压力分布的差异。
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