One application of fusion proteins

The present invention discloses an application of fusion proteins, for stimulating bone marrow mesenchymal stem cells, hematopoietic stem and progenitor cells to drug /; or granulocyte proliferation of hematopoietic progenitor cells medicament, such as the fusion protein sequence of SEQ? ID? NO: 2 or SEQ? ID? FIG 4: NO. And the medicament can be used for the prevention and / or treatment of (i) low hematopoietic function caused by chemotherapy; hematopoietic function (ii) radiation-induced low; or (iii) leukopenia.