Objective To observe the effect of Lisui Decoction in treating low-risk type myelodysplastic syndrome (MDS).Methods 79 such cases were randomly divided into a group treatment group with 45 cases and a control group with 34 cases.The treatment group Was treated wim Lisui Decoction and the control group was treated with Stanozolol RAS and vitamin B6.Such indexes as clinical curative effects,peripheral blood,and changes of T cell phenotypic subpopulations and medulla picture were observed.Results There was between the treatment group and the control group.The CR rate was 8.57%and 2.94%.and the total effective rate was 71.1%and 38.2%in the treatment group and the control group respectively,showing significant difierence.The peripheral blood.T cell phenotypic subpopulations and the dysplastic hematopoiesis in erythroid also showed significant difiefences.Conclusion Lisui Decoction can improve hematopoiesis of bone marrow and it is effective in treating low-risk type myelodysplastic syndrome.