The drag reduction characteristic of the flow around underwater vehicle is simula-ted based on the homogeneous equilibrium theory by using commercial CFD Code Fluent 6.3. The drag coefficient change law , force condition and drag reduction characteristics of the ve-hicle were studied in this paper .When the supercavity forms around the vehicle , the pres-sure coefficient decreased , and the viscous drag coefficient almost decreased to zero .The to-tal drag coefficient decreases greatly compared with non -cavitating flow around vehicle and the streamlined ones .The head of vehicle bears almost all of the drag , and the drag beard by the latter of vehicle decreased almost to zero .The supercavitation forms easily as the cavita-tor diameter increased , but the drag reduction ability of supercavitation decreased .When the cavitator diameter was too small , the supercavitation can ’ t form, and the drag reduction characteristic of supercavitation was ineffective .%利用Fluent6．3对水下航行体超空泡减阻进行了数值模拟，研究了水下航行体空泡形态和阻力系数的变化规律，分析了航行体的受力和减阻特性．结果表明，水下航行体在超空泡绕流时，压差阻力系数减小，摩擦阻力系数减小并趋于零，总阻力系数比无空泡绕流时大幅度降低，比流线型模型的也小；航行体的头部在超空泡绕流时承受了绝大部分阻力，尾段所受阻力减小至几乎为零；头部空化器直径增大，超空泡较易形成，但减阻能力降低，空化器直径过小，不能形成超空泡，不能有效减阻．
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