Professor Zhang Jin-feng believes that kidney yin deficiency is the origin of recurrent abortion, while blood stasis and liver depression are the manifestations. So he has created a three-step ladder therapy of"clearing", "seeding"and"stabilizing"and treated it by stages. "Clearing"means clearing the uterus and pre-culturing its damage. The treatment starts with regulating immunity and eliminating inflammatory infection. The self-made experience formula, Decoction for Inhibiting Hyperactivity and Helping Pregnancy is often used. "Seeding"means nourishing yin and yang, regulating menstruation for pregnancy. In the clinical treatment, the formula should be selected according to the menstrual cycle. The blood chamber during menstruation is open, and"treating incontinent syndrome with dredging method"should be adopted, so Menstruation-Regulating Powder can be used to promote blood circulation and drive ,qi, movement. In postmenstrual period, the uterus is empty and the uterus stores up essence without discharge. No. 1 Formula for Helping Pregnancy is selected to tonify the kidney arrest emission, and promote the development of follicles. During menstrual interval period, it is the dense period of yin transforming into to yang. The treatment principle is to nourish yin and yang, tonify the kidney and activate blood circulation. In the premenstrual period, yang ,qi, grows gradually. The treatment is mainly to maintain the function of corpus luteum, tonify the kidney and help pregnancy. The formula is self-made Fetal-Sitting Formula. "Stabilizing"means tonifying the kidney and calming the fetus and stabilizing the fetal original ,qi,. The fetal protection treatment for patients with recurrent abortion should be carried out as soon as possible without waiting for clinical symptoms, and the fe-tal protection time should exceed the previous abortion gestational weeks. Fetus-Preserving Pill is often used. Professor Zhang uses the three-step ladder therapy to treat recurrent spontaneous abortion by nourishing yin and tonifying the kidney. At the same time, he pays attention to promoting blood circulation, removing blood stasis and regulating emotion, and has achieved good clinical results.