Abstract:To study the effects of Siwu Tang on the mice of blood deficiency induced by cyclophosphamide,we employed the methods of circulating blood cells detection by microcellcounter,flow cytometric enumeration of CD34+ himatopoietic stem and progenitor cells by double fluorescent labeling.The results showed Siwu Tang promoted the recovery of stem and progenitor cells and circulating WBC on the blood deficient mice,and enhanced immune function.proliferative effect of Siwu Tang on bone marrow may play a key role in improvement of hematopoiesis with Siwu Tang treating blood deficient mice.