Abstract: The potential geographic distribution areas of Toona sinensis in southwestern China regions and their climate characteristics were analyzed based on DIVA-GIS.The analysis results showed that the distribution elevation of T.sinensis ranged from 200 m to 2 900 m and T.sinensis trees were distributed in broad-leaved and needle leaved mixed forest,broad-leaved forest,planted forests and farm-shelter forest.The suitable mean annual temperature and annual precipitation for the growth of T.sinensis were 11.7℃~22.8℃ and 752.0 mm~1 490.0 mm,respectively.The geographical distribution and the potential regions of high suitability for T.sinensis were the Sichuan basin and its surroundings,the hill and low mountain regions in Yunnan,Chongqing and Guizhou,and Chayu and Bomi counties of Tibet.The global warming might lead to the shrinking in its suitable regions and it might have a tendency of shifting to high-altitude and northwestern regions.