This study aimed to establish the method on high performance liquid chromatography determining carminic acid.Comparing the different kinds of mobile phase,different flow rate and temperature of the column.The result showed that when mobile phase was consist of acetonitrile,methanol and phosphoric acid(0.01%)(volume ratio 10∶15∶75),flow rate was 0.8 mL/min,column temperature at 20℃,peak shape was the best.This mothed used for determined carminic acid both at 280 nm and 494 nm.Carminic acid(purity:100%) was u...