After abortion, most women’s blood HCG will decrease at a rate of 60% every other day, and clinically the blood HCG will turn negative after about 10 days. However, due to individual differences, the rate of decline of blood HCG is different for each person, and some people will not turn negative until about one month, which is also a normal phenomenon in the clinic. As long as there is a gradual decline, it is a benign process, but if the blood HCG does not decline after abortion and still has a rising trend clinically, the possibility of choriocarcinoma should be ruled out. In addition, it is recommended to exclude the possibility of incomplete abortion, and ultrasonography can be done, and if there is any residue in the uterus, timely removal can be given, and it is recommended to continue to monitor the blood HCG after the removal.