Before pregnancy the woman needs: 1, routine examination of the leukorrhea: through the leukorrhea routine screening trichomonas, mycobacteria, mycoplasma, chlamydia infection and other vaginal inflammation and other diseases. 2, cervical examination: through the cervical liquid-based cytology examination and human papilloma virus test can find early cervical lesions, early treatment, to avoid causing significant personal and family losses. 3, gynecological ultrasound and thyroid and breast ultrasound: ultrasound in the preconception examination program can help to understand the development of the uterus, to understand the first pregnancy whether there is uterine deformity, uterine fibroids and uterine adenomyosis, ovarian cysts and so on are factors affecting the pregnancy, and to understand the presence or absence of thyroid and breast diseases. 4, eugenics four tests: including: rubella virus, cytomegalovirus, herpes simplex virus and toxoplasmosis test. Because these special pathogens infection can cause intrauterine infection of the fetus, and also is one of the important causes of birth defects in newborns. 5, Hepatitis B and liver function, kidney function, fasting blood glucose test: if there is hepatitis B or carrying hepatitis B antigen, it can do timely treatment to avoid vertical transmission from mother to child. 6, thyroid T3, T4, TSH examination, screening for thyroid disease. 7, there are family genetic diseases must be performed chromosome examination.