In this paper, the reason of axial magnetized TPMLSM salient pole force has been discussed, as well as its calculation formula. Calculate force with the virtual work principle. Then the relation between the maximum with average of the force and its phasic forward angel, has been explained, as well as the function of salient pole force and its location. Furthermore, a kind of method notching iron magnet poles to decrease axial magnetized salient pole force has been introduced, and the influence impressed on the force by notching has been analyzed qualitatively. Obtained field distribution by finite element method slotted magnetic. Compared the salient force of different number slotted iron pole. In the end, finite element method has been utilized to testify the availability of this way to decrease salient pole force.