Aiming at the problem of getting the extended Kalman filter(EKF)optimal value of system noise matrix and mea-surement noise matrix using in induction motor speed estimation,this paper proposed a speed estimation method using EKF optimized by improved particle swarm optimization(IPSO).By combining the advantages of genetic algorithm and particle swarm optimization,it adopted an adjustable algorithms in PSO.It optimized the EKF system noise matrix and measurement noise matrix by IPSO,using optimized EKF to es...