Objective To obtain different polarity composition groups in Buyang Huanwu decoction with solubility parameter method, and to provide new ideas, methods and experimental basis for compound effectiveness research on traditional Chinese medicine(TCM). Methods Different polarity composition groups in Buyang Huanwu decoction were obtained by different solubility parameter solutions as n-hexane, n-hexane-n-butanol(1 :1), n-butanol, alcohol, methanol, 83% methanol, 68% methanol, 51% methanol, 34% methanol, 18% methanol and water, and their finge...