Abstract: Cost of permanent magnet linear synchronous motor is high in application situations of long distance and large thrust because it needs many central windings and permanent magnets.Aiming at the problem,the paper took economy index as target,adopted improved genetic algorithm which was combined with adaptive parameter adjusting and adaptive value calibration,and realized optimization design of permanent magnet linear synchronous motor through selecting optimization variable and determining constraint condition and objective function.After analyzing and comparing each performance index of motor before and after being optimized,it was gotten that the optimization method can improve comprehensive performance index of motor,enhance its thrust and decrease its volume,so as to reduce product cost of motor.