Inclusion Criteria:  Meet the diagnostic criteria for infertility. Meet the criteria for identifying kidney deficiency in TCM. Patients who Planning to undergo IVF-ET for pregnancy in our center, Age ≤40 years and ≥25 years. Previous embryo transfer failure ≥ 2 times. Menstrual cycle is basically normal, and normal ovulation has been monitored in the past. There were more than 1 blastocyst /more than 2 high-quality embryos with more than 6 cells on day 3/more than 2 high-quality embryos with more than 4 cells on day 2. Consent to participate in this clinical trial and sign an informed consent form.  Exclusion Criteria:  Patients with endometritis, acute pelvic inflammatory disease, mycotic vaginitis, bacterial vaginitis, adnexitis or other systemic infections. It has been confirmed that there are obvious and serious other organic lesions in the reproductive organs. Patients with allergic constitution Infertility caused by genetic factors Patients with serious primary diseases such as cardio cerebrovascular, kidney, liver and hematopoietic system and psychosis A person who is unable to cooperate (such as a combination of neurological or mental illness, or a reluctance to cooperate) The endometrial thickness on the day of hCG was less than 6 mm or the endometrial morphology on the day of hCG was type C Those who did not agree to participate in the study