Abstract: Using priority ratio of fuzzy equihrm of Eu-clidean distance,three masson pine superior provenances were studied on their extension adaptability in Zhejiang Province.some ecological factors, including water and heat quantity,and height & diameter growths of those provenance offsprings were selected as equiform factors,three seed sou rces were used as fixed sample to compare those and the climatic factors,growths of every site in Zhejiang,The analysis results coin-cided with field measures of ten-year-old provenance trial stand,that the seed source of Guigang of Guangxi County mainly suits central and western regions of Zhejiang,that of Longshen of Guangxi mainly suits eastern and central regions of Zhejiang,and that of Changning of Hunan Province mainly suits central, and southern regions of Zhejiang.