Abstract: Recent research indictates that human umbilical cord is rich in mesenchymal stem cells. These cells have the potencies of expressing many surface markers of mesenchymal stem cell, differentiating into a variety of cells of three germ layers, synthesizing and secreting a set of trophic factors and other cytokines, and supporting the expansion and function of other cells hematopoietic stem cells and other cells. In addition, immunogenicity of these cells is realatively low.