Abstract: In order to overcome the shortcoming of sodium cooled fast reactor mechanical sodium pump including mechanical wear, large noise, sodium leakage and the shortcoming of electromagnetic pump including small flow rate and small pump head, the large flow rate sodium pump design based on saddle superconductive magnet was put forward. The structure of sodium pump was researched and the mathematic model was established. The performance including pump head, flow rate and efficiency were researched at different currents, magnetic flux densities and temperatures using the computer code programmed with Matlab. The result shows that the pump head will reduce with the channel width increasing, current reducing and magnetic flux density reducing, and the efficiency will reduce with the current reducing and magnetic flux density reducing. If the temperature overtops 400 ℃, the efficiency will be high because of contact resistance disappearing. The flow rate of the saddle type superconductive sodium pump can be controlled by current and magnetic flux density, and the current is more suitable. This research can provide foundation for concreting design.