Abstract: For the patients with tumor, the commen toxic-side reaction after chemotherapy isarrest of bone marrow, and leukopenia is the most popular one.In this paper,the prophylactico-therapeutic effects of Gujin Mojipian for this reaction in the mice with tumorafter chemotherapy were observed.The results show that Gujin Mojipian can cut downthe degree of the decline of the number of WBC, shorten its sustained time and promoteits recovery.These indicated that Gujin Mojipian not only has an effect of protecting thehematopoietic function of bone marrow, butalso has an effect of promoting it.