In general, the HCG value of all trophoblastic diseases is generally high, while trophoblastic tumors in the placental area only respond focally to HCG, so most patients have mildly elevated or no elevated HCG; other trophoblastic diseases such as staphyloma, erosive staphyloma or choriocarcinoma have HCG values of tens of thousands or even 200,000 mIU/ml. If the HCG of staphyloma is >100,000 mIU/ml and If the HCG of gravida is >100,000 mIU/ml and the age is >40 years, the risk of malignant progression of gravida to trophoblastic tumor should be highly alerted. Therefore, there is no fixed value of HCG in trophoblastic tumors and it is closely related to the patient’s condition.