Abstract: Based on the statistical method of GIS Technology, we conducted a research into the environmental adaptability of radix Pseudostellaria heterophylla （Miq.） Pax in complex geographical environment. Radix P. heterophylla （Miq.） Pax grown in Shibing of Guizhou Province as an example, twelve evaluation factors are chosen to evaluate the suitability to grow of radix P. heterophylla（Miq.） comprehensively,and they are effective accumulated temperature,annual rainfall,elevation,gradient,slope direction,soil pH value,soil organic matter,alkali-hydrolysable nitrogen,available phosphorus,available potassium, guarantee rate of drainage and traffic access degree which influence the quality of radix P. heterophylla （Miq.）’s grown. The results indicate that the area for planting Radix P. heterophylla（Miq.） is 18 114.55 hm² in Shibing County, which accounts for 76.75% of the county’s cultivated area. For the total planting area, the acreage of highly suitable and generally suitable for planting are 2 475.92 hm² and 6 440.69 hm²,respectively,while correspondingly,the tea crop area of the whole county they occupied are 13.67% and 35.55%. The highly suitable areas mainly distribute at Niudachang town,Chengguan town, and Baidu town. Among these,Niudachang town takes up 1 292 hm² of the cultivated area accounting for 52.2% that of the whole country.

Key words: GIS, geostatistic, Pseudostellaria heterophylla （Miq.） Pax, suitability evaluation