Objective: To determine Tanshenone Ⅱ_A content in Compound Dansheng Soft Capsules.Methods: The content determinations of Tanshinone Ⅱ_A in Compound Dansheng Soft Capsules were car-ried out by RP-HPLC on Diamonsil C_(18) column. The mobile phase was methanol-water (73:27) with1.5ml/min of flow rate, and the detection wavelength was at 270nm. Result: The linear range of Tan-shenone Ⅱ_A content determinations was 8μg~80μg/ml, r=0.9999 (n=5). The average recoveries was99.60%,RSD was1.10%. Conclusion: The method...