Abstract: This paper is based on the climate data of 17 meteorological stations in Liangshan Prefecture between the year 1981 and 2010，using GIS technique to regionalize the climatic adaptability of autumn buckwheat in Liangshan prefecture．By analyzing the main climatic factors and key periods which affect the production of autumn buckwheat，it could indicate some indexes of climatic adaptability regionalization of autumn buckwheat．This paper takes advantage of the climatic data of every station and its corresponding geographic information factors，applies multiple linear regression method and builds the spatial distribution model of regionalization indexes．It adopts the GIS spatial overlay analysis method to divide autumn buckwheat production areas in Liangshan prefecture into suitable areas，sub suitable areas and unsuitable areas．The result of regionalization provides the scientific basis for the rational distributions，pursuing benefits and avoiding harms and high quality and efficiency of autumn buckwheat production in Liangshan prefecture．