Abstract: Based on the geographic information and climate data from 114 meteorological stations in Henan province during 1971-2000,the climatic elements in grids of different growth phases of cotton,including average temperature,total precipitation and sunshine hours,were established by using gradient plus inverse distance squared technology.According to the climatic suitability models and the parameters in different stages of cotton growth,the climate suitability values of precipitation,temperature and sunshine hours in different growth phases were calculated.The comprehensive impact of three factors was evaluated by the relative weight method.Three regions for cotton planning in Henan province were divided by using agricultural climatic division factors,which were the most suitable region,the suitable region and the sub suitable region.The most suitable region included north,east and south west of Henan province,the suitable region included central southern part,and the sub suitable region included the west hilly region,the north mountain area and the south region of Huaihe River.

Key words: Cotton, Agricultural climate division, Precise comprehensive, Henan province