Abstract: Based on meteorological data of 9 stations from 1957 to 2007 in Henan province,the difference of climate change in Huaihe valley was analyzed by using linear regression,mathematical statistics with ArcGIS.The results showed that the north-south dividing line of climate in Henan province was the area(between 34°40′N and 34°50′N) among the east of Qinling mountain and Shaying river,which is the largest tributary of Huaihe valley.The temperature increased both in south and north of Huaihe valley,but it changed in different period.For example,it increased consistently before 1960s,but decreased slightly during 1960s-1980s.Since mid-1980s the temperature increased intensely.The annual average precipitation decreased before 1980s both in south and north.However,it decreased intensely in north and increased intensely in south during 1980s.Both increased simultaneously in 1990s.In general,it was abrupt change stage in 1980s as it kept high temperature and more rainfall and big temperature difference between north and south after 1990s.

Key words: Climate change, Climate change, Qinling-Huaihe, Variance, Henan province