Vaginal inflammation should be ruled out before painless abortion. If it is acute vaginal inflammatory infection, abortion surgery should be done after treatment. Secondly, painless abortion surgery, like normal abortion surgery, needs to confirm intrauterine pregnancy, that is, yolk sac or embryo heart tube can be seen in the uterus before abortion surgery can be performed. Painless abortion requires fasting for at least 6 hours before operation, that is, you can't eat or drink water within 6 hours. Before painless abortion, it is necessary to check the routine of hematuria, coagulation, infectious diseases, hepatitis B, syphilis, AIDS and so on. After these tests, if there is no problem, painless abortion can be carried out.