Because of the barrier function of the skin, most drugs cannot reach the need of therapy when they were used in transdermal delivery system.So enhancing transdermal absorption is one of the most important aspects of the study of topieal application of drug products.The use of traditional Chinese medicine(TCM)in delivery system has a long history,but the complexity of the TCM increases the difficulty in the study of transdermal absorption.This article reviews the research process on methods of enhancing tran...