Because of the special structure of submersible motor，the saturated effect in the yoke during the starting process can not be ignored． In order to increase the calculating accuracy of the starting performances，a magnetic network model was established and the calculating method with the magnetization curve taking the yoke saturate effect into account was proposed in this paper． The magnetic field distribution in the starting process wassimulated by using the finite element method for a 6 k W submersible motor and the experiment was made for thesame motor． It shows that the calculation results by the magnetic network method in the paper and the experimentaldata are very close． Compared with the traditional calculation results the method greatly reduces the error． The cal-culation accuracy of starting performance is effectively improved．