Objective: To explore the effects and possible mechanisms of Guiqi Oral Liquid (归芪口服injured mice were randomly divided into 2 groups: the treated group and the control group, and also a normal control group was set up with 6 mice in it receiving no treatment. After the mice in the former two groups were irradiated by 6.0 Gy 60Coγ-ray, every one of them was given 0.4 ml GQOL or saline in equal volume through a gastric tube twice a day for 14 days. On the 4th, 8th and 14th day after irradiation, the bone marrow mononuclear cells (BMMNC) and megakaryocytes in bone marrow tissues of the mice were counted, the proportion of hematopoietic tissues (by area) was measured, and the expression of adhesion molecules, CD44 and CD54, in bone marrow were estimated by immunochemistry. The colony forming unit of spleen (CFU-S)in the mice were counted on the 8th day after irradiation. Results: On the 4th, 8th, 14th day after irradiation,the count of BMMNC and megakaryocyte, and the proportion of hematopoietic tissues in the treated group were higher than those in the control group (P＜0.01 or P＜0.05). CD44 and CD54 expression in the treated group were higher than those in the control group on the 4th and 8th day (P＜0.01), but near normal on the 14th day ( P＜0.01). On the 8th day, CFU-S count in the treated group was higher than that in the control group (P＜0.01). Conclusion: GQOL can regulate the expression of adhesion molecules, CD44 and CD54, in the bone marrow of the acute irradiation injured mice, which may be one of the mechanisms of GQOL in accelerating the early phase hematopoiesis recovery of mice.