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The series of multi-stage pump rotor parts mainly by the shaft and installed on the shaft of the impeller, shaft sleeve, balance disc and other parts form, which the number of impeller according to the pump series. The shaft parts are fastened to the shaft with the flat key and the shaft nut. The whole rotor is supported by rolling bearings or sliding bearings at both ends. The bearing is different and the model is different, the axial force is not to be balanced, and the axial force is balanced by the balance disc. Pump in operation allows the rotor in the pump shell in the axial direction can not be used to the ball bearing. Rolling bearings with grease lubrication, sliding bearing lubricated with dilute oil, and oil ring for self lubrication, circulating water cooling.