Abstract:Yugansu Pill was made of several herbs. The quality standard was studied according to requirement by "Evaluation of New Drugs". In addition to the microscopy method, a qualitative identifying method by TLC was established for saikosapoin A and D, forsythin, puerarin and Herba Artemisiae Annuae. And also, baicalin and puerarin were quantitatively determined by HPLC.