Abstract:Using GNSS observation data of CMONOC, combned with typhoon event data, we study the influence of typhoon events on water vapor cycle in Chinese mainland area. We find that under the influence of typhoon, the change period of GNSS ZTD will be shortened compared with normal weather, and precipitation will increase. Compared with the rainfall process, we find that before the rainfall occurs in the typhoon process, ZTD will change violently and keep at a peak value. By comparing and analyzing GNSS stations with different distances from the typhoon center, a typhoon’s first passing through the regional station fluctuates earlier than ZTD’s later passing station, and typhoon precipitation in the first area is greater than in the second area. This analysis of the periodic variation characteristics of water vapor in Chinese mainland during typhoon events, can provide reference value for typhoon track forecast, typhoon disaster warning and extreme precipitation warning of meteorological departments.