Abstract: Climatic similarity principle is a basic principle for agro‐climatic ecological adaptability regional‐ization ,agricultural production layout and industrial structure adjustment .About how to make climatic similarity analysis ,there have been a number of researches and explorations in the past ,but most of them are about a single climatic factor's similarity and ,therefore ,cannot reflect the multi‐factor comprehensive climatic similar degree .In a study reported in this paper ,spring buckwheat climatic adaptation zoning was made in Liangshan prefecture ,based on multi‐factor climatic weighted similarity analysis and GIS analysis techniques .This regionalization used the climatic weighted similarity distance as the regionalization index , and with Zhaojue as a reference point .Through research and a comparison with the local buckwheat com‐petitive industry planning ,the regionalization method based on multi‐factor climatic weighted similarity was shown to be more realistic and to have good usability .This result provides a scientific basis for the spring buckw heat layout in Liangshan prefecture .