Abstract:Objective: To prepare an inclusion complex of daidzein and hydropropyl-β-cyclodextrin to enhance the solubility of daidzein.Method: The inclusion complex of daidzein was prepared by the solution stirring method. The binary system of daidzein and HP-β-CD was confirmed by differential thermal,thermogravimetry analysis, infrared spectroscopy and X-ray diffractometry.Result: The drug content in the inclusion complex was 6.76% and the solubility was 13.68 mg·mL-1. The identification results showed that the inclusion complex was formed. Conclusion: The preparation method of the inclusion complex of daidzein and hydropropyl-β-cyclodextrin is simple and available,with a increased solubility of daidzein.