Objective: To investigate the effect of Yiqi Shengxue decoction in the treatment of bone marrow suppression on the KPS score and G-CSF, IL-11 levels of after breast cancer chemotherapy.Methods: Ninety-six breast cancer patients admitted to a hospital from Jan. 2018 to Dec. 2019 were selected as the research objects, and they were divided into the control group and the study group by the envelope method.The control group was treated with single chemotherapy + western medicine to promote blood, and the study group was treated with western medicine to promote blood + Yiqi Shengxue decoction after chemotherapy.The KPS score and TCM syndrome score, G-CSF and IL-11 levels, and blood indexes levels were compared between the two groups.Results: The KPS score of the study group was higher than that of the control group, and the TCM syndrome score was lower than that of the control group(P<0.05); The G-CSF and IL-11 in the study group during the treatment process were lower than those of the control group(P<0.05).The levels of WBC, Hb and PLT in the study group were higher than those in the control group during the treatment process(P<0.05).Conclusion: Intervention with Yiqi Shengxue decoction for breast cancer patients undergoing chemotherapy can reduce G-CSF and IL-11 levels, increase KPS score, reduce TCM syndrome score, and also benefit the improvement of blood indicators.The application effect is good, and it can be considered for promotion.