在不同叶片数条件下对使用甚广的６５Ｙ６０型离心油泵输送清水时的性能进行了实验研究，得到最优的叶片数为５片。计算了最优工况的叶轮内部流动，得到了滑移系数与叶片数的关系。预测了最优工况的泵效率，阐释了泵内部流动与性能的关系。 Experiments were carried out on the performance of 65Y60 Centrifugal Oil Pump under different conditions under different conditions of leaves. The optimum number of leaves was 5. The internal flow of the impeller in the optimal working condition was calculated and the relationship between the slip coefficient and the number of blades was obtained. The pump efficiency of the optimal working condition is predicted, and the relationship between the internal flow and the performance of the pump is illustrated.