In recent decades, the protection of traditional medicine under the intellectual property system has been the subject of many efforts that was made by international community and especially less developed countries which are rich in this field. Since this knowledge has the unique characteristics and other current legal systems of intellectual property can not protect all aspects of it, the world intellectual property organization (wipo) decided to analysis establishment of special legal framework as a sui generis system to protect it. This article studies impossibility of protecting traditional medicine under current legal systems of intellectual property and finally proposes a model of sui generis system.