ＧＰＳ快速静态定位模式，在进行三、四等以下平面控制网观测方面应用较多，它主要采用单基准或多基准方式。在采用静态同步环方法完成唐山市二等平面控制网的同时，我们实践了一种目前还没有应用于高等级网的施测方法，即采用“快速静态同步环方法”。通过两种方法观测结果的处理、分析、比较，最后得出了快速静态同步环方法可以进行城市二等平面控制网观测的结论。 GPS fast static positioning mode is widely used in the three-and-four-level planar control network observation. It mainly adopts a single reference or multi-reference mode. While using the static synchronous ring method to complete the second level control network in Tangshan City, we have implemented a test method that has not yet been applied to high-grade networks. That is, the “quick static synchronous ring method” is adopted. Through the processing, analysis and comparison of the observation results of the two methods, the conclusion that the fast static synchronization loop method can be used for urban second-class plane control network observation is obtained.