An idea of using multipoint layer-type laser Doppler self-velocimeter (LDV) to offer velocity for vehicle navigation system is proposed,because the accelerometer has the error term generated by overload. The principle of measuring its own velocity with laser Doppler is expounded while multipoint layer-type LDV is designed. And Doppler signal is processed with the technique of tracking filter and digital autocorrelation. The results of theory and experiment show that,multipoint layer-type LDV can solve the problem that dual-beam LDV can not measure the velocity while out of focus. Background signal and part of noise in the passband are restrained by tracking filter,and residual noise is removed by digital autocorrelator so that the signal-to-noise and sensibility of the system are raised. Comparing with global position system (GPS),the relative accuracy of the system is about 2%.