The Crustal Movement Observation Network of China (CMONOC) is one of the major national scientific projects, which is a GPS based integrated application network, consisting of 260 stations over the whole country. The China Meteorological Administration uses CMONOC data to conduct the real time monitoring of total water vapor. Aiming at GPS data management issues of the CMONOC.GNSS data sharing system, based on the B/S structure system and the open source WebGIS layout, a data management system of ground based navigation satellite remote sensing water vapor is developed by using Flex, JSP and Applet technology, and the real time monitoring of GPS station data transmission, the unified management of the station information, etc., are achieved, so to meet the needs of the current monitoring and safeguard of ground based GPS stations.