There are the following cases of blood in pregnancy: i. If it occurs in early pregnancy, most of them are suspected to have pre-eclampsia, miscarriage, or embryo abortion. It is best to go to the hospital to do gynecological ultrasound, blood HCG and progesterone examination, if it is simple preeclampsia, give birth control treatment. Observe first, if there is embryonic sterilizations, you need to terminate the pregnancy as early as possible so as not to cause intrauterine infection. Secondly, if vaginal bleeding occurs in the middle and late stages of pregnancy, placenta praevia is mostly considered. It is necessary to take bed rest, regular review of ultrasound, observe the growth and development of the fetus in the uterine cavity, try to take bed rest, carry out hemostasis, anti-infection treatment, promote the growth and development of the fetus, and terminate the pregnancy as early as possible after the maturity of the fetus.