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TCMGIS-I(Suitability evaluation geographic information system of traditional Chinese medicine producing area ) was used to analyze the ecological suitability of Zhecheng RADIX POLYGONI MULTIFLORI in China and the ecological suitability in the main production area of Henan Province. With Laowangji Village of Zhecheng County in Henan Province as the basic point for analysis, key ecological factors affecting the growth of Zhecheng RADIX POLYGONI MULTIFLORI were selected, such as temperature, altitude, soil and precipitation. Results showed that there were 9 provinces in China that were suitable for the growth of Zhecheng RADIX POLYGONI MULTIFLORI theoretically. When the similarity reached 90%-100%, the adaptive production area of Zhecheng RADIX POLYGONI MULTIFLORI was 149 036 km2 in China theoretically. Among them, Shandong and Hebei Provinces had the largest distribution area, which was more than 54 000 km2, followed with Henan, Liaoning, Tianjin and Shanxi. When the similarity degree was 90%-100%, distribution of Zhecheng RADIX POLYGONI MULTIFLORI in Henan Province was concentrated in Zhecheng County, Lin County, Anyang County and so on, which accorded to the literature records in the past dynasties.
TCMGIS-I (Suitability evaluation geographic information system of traditional Chinese medicine producing area) was used to analyze the ecological suitability of Zhecheng RADIX POLYGONI MULTIFLORI in China and the ecological suitability in the main production area of Henan Province. With Laowangji Village of Zhecheng County in Henan Province as the basic point for analysis, key ecological factors affecting the growth of Zhecheng RADIX POLYGONI MULTIFLORI were selected, such as temperature, altitude, soil and precipitation. Results showed that there were 9 provinces in China that were suitable for the growth of Zhecheng RADIX POLYGONI MULTIFLORI theoretically. When the similarity reached 90% -100%, the adaptive production area of Zhecheng RADIX POLYGONI MULTIFLORI was 149 036 km2 in China theoretically. Among them, Shandong and Hebei Provinces had the largest distribution area, which was more than 54 000 km2, followed by Henan, Liaoning, Tianjin and Shanxi. When the similarity degree wa s 90% -100%, distribution of Zhecheng RADIX POLYGONI MULTIFLORI in Henan Province was concentrated in Zhecheng County, Lin County, Anyang County and so on, which accorded to the literature records in the past dynasties.