If there is a history of bad pregnancy and delivery such as fetal abortion, a comprehensive preconception checkup is recommended before the next pregnancy. The main examination items are as follows: 1. embryonic chromosome examination: before the next pregnancy after miscarriage, it is recommended to conduct chromosome examination for both spouses to understand whether there are chromosome problems, and if there are chromosome problems to conduct further follow-up examination to avoid fetal abortion next time. 2. semen examination: it is necessary to check semen volume, semen liquefaction time, sperm count, sperm morphology, sperm motility and other conditions. Evaluate male fertility, and if there are problems with semen suggest treatment. 3.Female examination: Hysterosalpingography, 3D imaging, etc. can be done to check whether there is any malformation of the uterus. To determine the presence of organic diseases of the uterus, such as fibroids, endometrial polyps, etc. Check ovarian function to find out if there is any problem with the follicles, and if there is small follicular ovulation, it should be treated promptly. If there is no abnormality in the above three tests, women may also need several tests such as thyroid function test, infertility antibody and TORCH test, and antiphospholipid syndrome screening to clarify the causes of fetal arrest.