Variations and trends in extreme climate events are more sensitive to climate change than the mean values,which have received much attention.In this study,the features for 8in-dices of precipitation extremes over Northern China are examined,broadly based on daily precipitation data from 90meteorological stations during the period 1951~2013.The methods of 9-year smoothing average,linear regression, Mann-Kendall test and continuous wavelet transform were employed to delineate the rate of change,abrupt change points,statistical significance of the trends,and periodicity of extreme precipitation indices.The results show that Consecutive Dry Days(CDD)exhibited significant increasing trend during the recent 63 years,the maximum 5-day precipitation(RX5day),Consecutive Wet Days and Annual Total Wet-day Precipitation( PRCPTOT)decreased by 0.05significance levels.Other 4extreme precipitation indices showed a decreasing trend,and not notable.There is an obvious linear variation trend in all extreme precipitation and Annual Total Wet-day Precipitation.Consecutive Dry Days and Annual Total Wet-day Precipitation have a weak correlation,other indicators showed a strong positive correlation.With regard to the period of variation,almost all extreme precipitation indices vary at three or four years scale,and most indices have such periods as 8a,16aand 32a.In terms of the change point,Consecutive Dry Days occurs in 1964,which much earlier than other indices.From the spatial distribution characteristics of extreme precipitation indices, the variation trend in central North China is more distinct.Consecutive Dry Days increases,and other indicators show a decreasing trend.