Abstract: The vertical deformation of 22 tide stations was analyzed with a unifying datum based on GPS continuous observation data from the Chinese coastal GNSS operational observing system during the years 2009-2013. The results show that:The periodic change of the GPS height time series at tide stations has a higher correlation with the tide. The trend of vertical deformation of 22 tide stations has not only small regional consistency, but also shows a significant difference in different sea areas. By studying the vertical movement of tide stations, researchers can effectively eliminate the influence of crustal movement on regional sea level change, to obtain actual sea level change.