中文摘要：

本文基于BERN5．0软件的动态计算功能，首先验证了GPS连续运行站观测数据单历元计算的可靠性，将其应用到汶川地震当天的观测数据，计算了全国29个连续运行站在地震前后30分钟的瞬时变化，获得了相应的同震变形，重点研究了泸州、西安、北京房山等站的变化情况，计算结果表明，在地震前后，各连续运行站监测到了明显的震间变形。

英文摘要：

It had been tested firstly on the reliability of single epoch method by GPS continuous observation reference station （CORS） data based on the dynamic computation function of BERNS. 0 software. This method had been used to compute the temporal deformation of 29 CORS data on Chinese continent 30 minutes before and after Wenchuan earthquake, after that got the co-seismic deformation. The deformation of LUZH, XIAN, BJFS station had been studied mostly and the result shows that the seismic deformation could be observed obviously by the CORS before and after earthquake using the single epoch method.