采用经典恒温加速试验法，对复方黄芩液中君药药效成分黄芩甙的变化进行考察，测定采用薄层扫描法。结果表明：复方黄劳液中黄芩甙含量的变化符合一级动力学过程；在室温（25℃）条件下，以黄芩甙为指标，该药的有效期为2．05年。 Classical isothermal accelerated test method was used to examine the changes of Radix Scutellariae, a medicinal ingredient of Compound Radix Astragali membranaceus, and thin layer scanning was used for the determination. The results showed that the change of jaundice content in the compound yellow solution was in accordance with the first-order kinetics; at room temperature (25°C), the effective period of the drug was 2.05 years with the jaundice as the indicator.