In this study，the ecological suitability of citrus medica L var.sarcodactylis Swingle was explored to provide a scientific and rational basis for its conservation，introduction and expansion.Methods:Based on 330 sites from the original appellations，main producing areas and distributions of the plant，the similarity in distribution was predicted with spatial analysis by GMPGIS.Results:The results show that China possessed the largest ecological similarity region，whose suitable area was about 89.98% of global ecological suitability region.And the domestic main suitability was distributed in the southern part of China，such as Guangxi，Hunan，Jiangxi，Sichuan，Guizhou，Guangdong，Yunnan，Fujian Province.In addition，Brazil was a potential extension area for the ecological adaptability region of citrus medica L var.sarcodactylis Swingle，and its ecological suitability area accounted for 5.87% of global ecological suitability region.Conclusion:The results of this study are consistent with the current production conditions of citrus medica L var.sarcodactylis Swingle，which can provide scientific and reasonable basis for the introduction and production of the plant in global region.