The doctor can only help you find the cause by asking a detailed medical history, menstrual history, fertility history, family history, past history, and a series of tests. Bring all previous labs, surgery records and treatment plans to avoid duplication of tests. Self-testing basal body temperature and record, bring it to the clinic. 1. Karyotype analysis for both partners (venous blood taken from the couple, not affected by dietary menstrual cycle). Embryonic SNP gene test (in case of unavoidable miscarriage, embryonic chorionic hair will be taken for sending at the time of uterine clearance, in Chiayi). 2.Semen routine for male partner (semen check for 3-5 days of abstinence), ultrasound examination of prostate, spermatic vein, etc. 3.BBT (Basal body temperature curve, self-testing basal body temperature every month). 4.Sex hormone 6 (blood FSH, LH, E2, P, PRL, T, ) (blood drawn on the 3rd-5th day of menstruation), thyroid hormone test (T3, T4, TSH, TPOAb, TGAb) (not affected by menstrual cycle), glucose tolerance test (OGTT), insulin antagonism (IR) measurement. 5.TORCH (cytomegalovirus CMV, toxoplasma TOX, rubella virus RUV, herpes virus HSV) IgM, IgG, mycoplasma, chlamydia (cervical mucus, non-menstrual), gynecological examination, routine leucorrhoea, BV, cervical TCT 6.Couple ABO blood type, Rh blood type, anti-A potency, anti-B potency. 7.Phospholipid antibody, D-dimer. 8.Zona pellucida antibody. 9.Closure antibody, unique type antibody, closure efficiency, Treg (RSA). 10.Hysterosalpingography (clean menstruation without intercourse; leukocyte trichomonas mycobacteria PC negative). 11.Hysteroscopy (clean menstruation without intercourse) (full preoperative set, ECG, ultrasound, etc.) (by appointment) Note: Bring all previous labs, surgical records and treatment plans to avoid duplication of tests. Treatment: Treatment for the cause of the disease.