Abstract: In order to control the quality of Forsythia suspensa,a simple and effective method for determining the content of Forsythia suspensa was studied.The content of forsythrin in the samples of Forsythia suspensa was determined by high performance liquid chromatography (HPLC).The content of Forsythia suspensa in the samples was analyzed by SPSS 16.0 software and the results obtained by Chinese pharmacopoeia method were analyzed statistically.The contents of Forsythia suspensa in the samples prepared by ultrasonic method were in accordance with the guidelines for the analysis of drug quality standards stipulated in the Chinese Pharmacopoeia,and there was no significant difference between the results obtained by the Chinese Pharmacopoeia method and the results obtained by the Chinese Pharmacopoeia method.Ultrasonic method simplifies sample pretreatment processThe measured results are accurate and efficient,and have great value of popularization.

Key words: Forsythia suspensa, HPLC, forsythin, ultrasonic method