Objective: To study the characteristics of the SiO 2/R 2O 3 in non-zonal purple soil in the light of the difference between
the high yield and low yield of Salvia miltiorrhiza.
Method: Both the high yield and low yield drugs developed from the same parental material (k 1cy) were chosen in the ecology area in Zhongjiang county ,Sichuan Province. By using the air-dried drugs as sample, quadrat sampling method was used to calculat the production. Gravimetric method, volumetric method, and colorimetric method and neutralization titration were used to measure the content of adhesive particle colloids element in the soil. And T-test was used for the variable-difference analysis. Result: There was a sharp contrast between the production of high yield and low yield drugs (P<0.001).The characteristic value of the high yield
soil embryology was much higher than that of the low yield soil. Conclusion: The characteristic value of the purple soil embryology is one of the important factors of the soil adaptability of the drug and its quality. The weathering degree of the soil is closely related to the yield of the drug.