To study the genuine soil of Astragalus menbranceus grows, FTIR spectrometry was used, which is accurate, simple and efficient and has high resolution. The genuine soils include six areas in Hunyuan of Shanxi province, three areas in Yingxian of Shanxi province, Fansi of Shanxi province, and Guyang of Inner Mongolia. Different growth years of two to five for each area were also studied. The results show that there are significant differences between Astragalus menbranceus soil FTIR spectrometry and general soil’s, between soil of Astragalus menbranceus growth and radix codonopsitis growth, between different soil of Astragalus menbranceus growth, providing useful information for the area chose of Chinese herb cultural and transplantation.