Aiming at harsh working environment of on board strapdown inertial navigation system（SINS）and problem of low precision of sub-inertial navigation system and poor alignment precision and real-time in transfer alignment of conventional Kalman filtering.Transfer alignment method for big azimuth misalignment angle speed matching based on LS-SVM is presented according to on-board special environment.Using input and output sample pair of traditional Kalman filter to train the LS-SVM filter

and avoid complex optimization computing in classical support vector machine（SVM）solving.Under the same conditions

compare with the conventional Kalman filtering simulation result

introduction of LS-SVM method can make system alignment time shorten nearly 50 %

and increase system alignment precision appropriately.