Abstract: According to the climatic condition of the Wen Radix Codonopsis growing,four climatic factors including the≥0℃accumulated temperature,the average temperature of the hottest month in a year,the aridity and the annual sunshine duration were selected as the indices to classify climate regionalization of Wen Radix Codonopsis planting in Gansu province,China.The spatial analyzing models of the these indices were constructed in different climate regionalization,respectively.And the regionalization indices in 100m×100m fine-grid were calculated.The fine-grid climate regionalization of Wen Radix Codonopsis planting in Gansu province was carried out by using ArcView9.2 with GIS technology.The optimum planting area,the suitable planting area and the unsuitable area for Wen Radix Codonopsis planting were classified.The results showed that the optimum planting areas and the suitable planting areas in Longnan mountainous areas of Gansu province were located in the most part of Wen county,Wudu county,Tanchang county and Zhouqu county,the part of Li county and Xihe county,and a small part of Cheng county and Kang county.These are also regions with the greatest potential to develop its production.

Key words: Gansu province, Gansu province, Wen Radix Codonopsis, GIS, Climate regionalization