Tracking maneuvering target with single station has many limitations, but multi-station can offer more information. Then multi-station has a problem of synchronization. By analyzing the course of updating the state, it's found that the tracking can be realized asynchronously and the multi-station dealing with the data in this manner makes the work completely flexible. So, multi-station in a net can increase the tracking range. To solve the non-linearity of the systems, a pseudo-linear observational equation is adopted. The simulation results indicate that this method is stable in tracking aerospace target. Furthermore, the increase in the number of the observation station can improve the precision.