Studying the impacts of climate change on water resource can help human beings take measures when facing problems. The results of HadCM3 and 7 meteorological sites’ daily data supplied by China Meteorological Administration in Qiantang River Basin are used to estimate design storms in 2020s under A1B scenario by both dynamic and statistical downscaling methods. The final results show that extreme storms will increase in 2020s under A1B scenario. Besides

the design storms for different return periods calculated through the dynamical method will increase more than those calculated through statistical method.