In order to weaken the normal force ripple existing between the mover and the stator in the movement of permanent magnet linear motor (PMLM)on the basis of deducing and analyzing the generation principle of normal force ripplethe optimal pole-arc coefficient and magnetic pole chamfer method are used to weaken the cogging normal forceand the optimization of core length and the end tooth shape are used to weaken the end normal forceso as to comprehensively weaken the normal force ripple of the PMLM. The effectiveness of the method is proved by finite element simulationwhich can greatly weaken the normal force ripple of the motor when the thrust requirements are met. The obtained conclusions can provide some theoretical guidance for the design of permanent magnet linear motors.