Abstract:We use the ITSG-Grace2018 daily gravity field solutions model to invert the changes of terrestrial water storage(TWS) in Chongqing from January 1, 2003, to August 31, 2016. We compare the model with hydrological data(WGHM, GLDAS) and precipitation data(CPC). The flood events from July 16 to 18, 2007, July 2 to 5, and July 8 to 13, 2012 in Chongqing are our focus. The results show that TWS derived from ITSG-Grace2018 is in good agreement with that from WGHM and GLDAS. The correlation coefficient between ITSG-Grace2018 water storage change and precipitation anomaly is 0.50, indicating precipitation is an important factor leading to TWS changes in Chongqing. For flood disasters shorter than one month, the monthly solution cannot give the spatio-temporal evolution process before and after flood, while the daily solutions can reflect more high-frequency details, but there is a time delay compared with the precipitation data.