Abstract: The relationships between grain yieldper unitand the distribution characters of radiation,Temperature and precipitation werequantitatively analyzed based on GIS,taken Anhui Province as a case study.The yearly grain yield of 78counties from 1950's to 2000 and the monthly mean solar radiation,temperature and precipitation of 78 meteorologystationsin Anhui Province were interpolated by using geo-statistics and associated GIS technology.On the basisof grid data,the relationships between the grain yieldper unitand the distribution characters of the different climate variables werequantitatively analyzed for each region based on the spatial analyst of GIS.The result showed that grain yieldper unit was restrained by temperature,radiation,and precipitationin sequence.In fact,the grain yield was comparatively low in the regions with the ascendant resources of radiation and temperature,and should take the measures better to utilize these resources and increase the grain yield per unit.

Key words: Grain yieldper unit, Grain yieldper unit, Radiation, Temperature and precipitation, GIS, Spatial interpolation