Based on the daily data of precipitation and temperature of 30 basic meteorological stations in the Hai River Basin from 1956 to 2010,12 indices characterizing the extreme climate change were selected to analyze the variation trends of extreme precipitation and temperature in the Hai River Basin.The results showed that (1) the intensity,frequency,and duration of extreme high temperature increase while the intensity and frequency of extreme low temperature decrease significantly in the Hai River Basin,which can reflect the overall increasing temperature trend in the basin;(2) the intensity of short-time extreme precipitation increases while the frequency of heavy precipitation decreases.The duration of consecutive wet days decreases,while the duration of consecutive dry days increases in recent decades,which suggests that the basin becomes a little dry;and (3) the frequencies of annual extreme high temperature and short-time extreme precipitation increase since 1990s,while the frequency of long-time precipitation decreases.The trend of warm and dry conditions and short-time precipitation can have negative impacts on the agricultural production and water resources development in the Hai River Basin.Meanwhile,the increasing of short-time extreme precipitation may exacerbate the risk of local flood disaster in the mountainous area as well as urban waterlogging.