Abstract: The principle and structure of a novel jetted self-priming set for the centrifugal pump was introduced. Different from the general centrifugal pumps, a self-circulation jetted set was added in the inlet of this pump, which connects with the reflux hole in the sixth section of the volute, so as to develop the self-circulation. In the process of the pump running, while the self-circulation process can be achieved, the valve of the self-circulation jetted set can be closed. This performance test of the pump demonstrated that the pump could complete the self-circulation process and could operate under the optimum condition. The H～Q curve is stable and flat, and the efficiency is 3% higher than that of the conventional centrifugal pumps.