If the HCG value does not decrease, it is necessary to consider the possibility of incomplete miscarriage, residual embryo, and whether there is a case of missed aspiration. If the HCG result does not return to normal after the procedure, malignant lesions of the chorionic villi need to be ruled out, and a timely follow-up ultrasound is recommended. For determining the presence of intrauterine residue, timely clearance surgery is needed, and if other malignant lesions are considered, further examination and treatment are needed.