Abstract: This paper carries out rainfall frequency analysis on spatial and temporal scale to explore the response of regional extreme-rainfall values to changing environments.In the analysis,annual maximum 1-day rainfall series in 22 gauging stations in Hunan in 1961～2019 was selected as data sources.The Hurst coefficient method was used to identify non-stationary rainfall series,then the natural and current models were respectively established by the wavelet decomposition and reconstruction methods,and rainfall design values under these two models were calculated.Afterwards,the rainfall spatial distribution was obtained by GIS spatial analysis.The results showed that there was a pronounced response of rainfall design values to changing surroundings in central and northern areas of Hunan Province.Maximum daily rainfall in the whole region demonstrated an increase trend compared to that in the past under the same return period.A general growth was presented in extreme-rainfall design values affected by changing environments,which would definitely increase the design risk.