Whether or not the uterus needs to be cleared after a spontaneous abortion on the 20th day of pregnancy should be examined in the hospital, and an ultrasound should be done to find out whether or not there is any residual tissue in the uterus, and to decide whether or not to clear the uterus according to the size of the residual tissue. If the residual tissue is relatively large and there is active bleeding, it is recommended that the uterus be removed as soon as possible, otherwise it may cause heavy bleeding. If the residual tissue is relatively small, drugs that activate blood circulation and remove blood stasis can be used to promote uterine contraction and expel the residual tissue in the uterine cavity, and then removal of the uterus is not necessary. If the clinic also needs to do a blood HCG test, under normal circumstances blood HCG will show a continuous decline. If the blood HCG does not fall but rises, and there is no residual tissue in the uterus through ultrasound, we should be highly vigilant that the original miscarriage is not partially hyperemesis gravidarum, and according to the results of the examination to do the next step of treatment, and if necessary, need to do the removal of the uterus.