Abstract:The quantity of active component-ephedrine of Herba Ephedrae in Qianbai Biyan Granules was determined using dual wavelength TLC-scanner.Senecio Scandens Buch,Herba Ephedrae,Rhizome Seu Radix Notopterygii,Semen Cassiae were qualitatively identified by TLC.The above methods appeared to be simple,reproducible with a high specialization,and can be used as a quality control standard for this preparation.