Wake flow fields generated by towing sphere were measured using PIV in large stratified fluids tank. Wake flow and internal waves in the density jump at different towing speed were acquired. The con-figuration of body-generated steady internal wave and wake-generated unsteady internal wave were known about visually. The rule of velocity of internal wave with internal Froude number was analyzed.%在大型分层流水池中采用 PIV 方法对跃变分层流体中小球尾流场进行了测量，获得了不同拖曳速度工况下跃层处的尾流及内波流场，对体效应稳态内波和尾流效应非稳态内波的特征有了形象直观的了解，获得了内波流场速度大小随内傅氏数的变化规律。
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