Objective:To study the effects of Jingyuankang capsule（JYK capsule） on the mouse hemopoiesis ancestor cells in cyclophosphamide（CTX） induced myleosuppression.Method:Group: Seventy male Kunming mice were randomly divided into normal group

model group

Likejun group

Tonic Capsule group

JYK capsule high dose group

JYK capsules medium dose group

JYK capsule low dose group.The mouse models of CTX-induced myleosuppression were adopted.All groups mice received an intraperitoneal injections of 100 mg·kg-1 CTX while normal group’s mice received NS as control in the morning for 3 days

and intragastric infusion with different drugs in the afternoon.then

only done those as in the afternoon.Model: the progenitor cell colony

progenitor cells cultured by implantation in vivo diffusion chamber method and count in the light microscope Olympus.Result: The results of hematopoietic progenitor cells in vivo culture: JYK each dose group could improve bone marrow progenitor cells（granulocyte monocyte progenitor cell CFU-GM

erythroid progenitor cells CFU-E/BFU-E

megakaryocyte hematopoietic progenitor cell CFU-Meg） colony yields rate of mices.JYK capsule high dose group was more produced.Conclusion: JYK capsule can promote the proliferation of hematopoietic stem cells by humoral factor or some of bioactive materials to increase three progenitor cells colony and promote the proliferation of damaged blood cells.