Abstract: The system of synchronous CDMA has large capacity, however it is difficult to implement in mobile satellite condition. So we consider establishing quasi-synchronous system. In this paper, the effect of quasi-synchronous error to broadband CDMA mobile satellite system is analyzed through computer simulation. The performance of CDMA system is improved distinctively in the condition of quasi-synchronous. This paper presented one strategy to realize quasi-synchronous in satellite environment, and discussed its feasibility. After analysis, we find that this strategy is feasible and implemented easier with the increase of orbit elevation.