The research of multiplexing and,transmission efficiency of SDHGAO Feng-ge Suzhou University of Science and Technology, Suzhou Jiangsu 215011,ChinaAbstract:The synchronous digital hierarchy （SDH） is a new generation digital transmission system which develops after the plesiochronous digital hierarchy （PDH）, it brought the issue of transmission efficiency lowly while overcame PDH＇s shortage and upgraded transmission performance. Could compensates for insufficiency while carry forward the superiority, that is raises transmission efficiency while maintains all merit of the SDH？ This paper proposes a concept of pointer-virtual container and multiplexing as well as relevant analysis discusses are in order to achieve that goal.[著者文摘]