A reversed-phase high performance liquid chromatographic method for simultaneous determination of four bioactive constituents was established for the quality control of traditional Chinese medicinal tablet Xinkeshu. Danshensu, protocatechualdehyde, puerarin and daidzein were successfully separated on a Diamonsil C18 column (150×4.6 mm i.d., 5 祄) with a guard column (12.5×2.1 mm i.d., 5 祄) packed with the same material at 25 ℃. The mobile phase was a mixture of acetonitrile and 0.02 mol/L potassium dihydrogen phosphate employing gradi-ent elution at a flow rate of 0.8 mL/min. Detection was accomplished with a diode-array detector and detection wavelength was set at 280 nm before 22 min, then it was varied to 250 nm. The four constituents were identified by comparing their retention time and UV spectra in the range of 190—400 nm with those of authentic standards. The linear calibration ranges were 15.4—123.2, 3.11—25.22, 21.6—172.8, and 0.26—3.47 礸/mL for danshensu, pro-tocatechualdehyde, puerarin and daidzein, respectively. The detection limits were 0.03, 0.04, 0.10, 0.03 礸/mL for danshensu, protocatechualdehyde, puerarin, and daidzein, respectively. The contents of these four bioactive con-stituents in Xinkeshu tablet were successfully determined by the proposed method. A reversed-phase high performance liquid chromatographic method for simultaneous determination of four bioactive constituents was established for the quality control of traditional Chinese medicinal tablet Xinkeshu. Danshensu, protocatechualdehyde, puerarin and daidzein were successfully separated on a Diamonsil C18 column (150 × 4.6 mm id , 5 祄) with a guard column (12.5 × 2.1 mm id, 5 祄) packed with the same material at 25 ° C. The mobile phase was a mixture of acetonitrile and 0.02 mol / L potassium dihydrogen phosphate using gradi- entlution at a flow rate of 0.8 mL / min. Detection was accomplished with a diode-array detector and detection wavelength was set at 280 nm before 22 min, then it was varied to 250 nm. The four constituents were identified by comparing their retention time and UV spectra in the range of 190-400 nm with those of authentic standards. The linear calibration ranges were 15.4-123.2, 3.11-25.22, 21.6-172.8, and 0.26-3.47 μg / mL for danshensu, p The detection limits were 0.03, 0.04, 0.10, 0.03 ng / mL for danshensu, protocatechualdehyde, puerarin, and daidzein, respectively. The contents of these four bioactive con-stituents in Xinkeshu tablet were successfully determined by the proposed method.