Change trend of temperature and precipitation in Huaihe River Basin from 1961 to 2008

Using the observed data from 170 meteorological stations in the area of Huaihe River Basin,we analyzed the changing trend of temperature and precipitation in Huaihe River Basin from 1961 to 2008.The results show that during the 48 a,the average temperature had a significant increasing trend in Huaihe River Basin,the average temperature in winter had the largest increment while the average temperature in spring and autumn had the second largest increment.The extreme low temperature over one year also had an increasing trend,but its frequency decreased significantly.The extreme high temperature in the west part of the basin had a significant decreasing trend and its frequency decreased over the year as well.The trend of the variance of the overall precipitation had not yet been tested,but started from the 1990s,the precipitation during autumn had a decreasing trend,but after 2000 the precipitation had been increasing significantly,as well as the precipitation during summer.The precipitation days during spring and autumn had a decreasing trend,while they did not change too much during winter and summer.