1. Staphylococcal fetus is named because of the proliferation of placental villi trophoblast and interstitial edema after pregnancy, and the formation of blisters of different sizes, which are connected into bunches by the emperor and shaped like grapes. It can be divided into complete and partial gravidity, most of which are complete gravidity. The exact cause of the occurrence of staphylococcal fetus is not yet fully understood, but some studies suggest that nutritional status is one of the possible high-risk factors, and the chance of staphylococcal fetus is significantly higher in those who lack vitamin A and carotene and animal fat in their diet. Age is also a risk factor, with women older than 35 years and younger than 20 years having a higher chance of having a pregnancy with staphylococytes, possibly related to the susceptibility to abnormal fertilization in these two age groups. A history of previous pregnancies is also a high-risk factor, and those who have had one or two pregnancies with gravida have a 1% and 15%-20% incidence of gravida again, respectively. 3. There is a risk of developing into erosive gravida and choriocarcinoma, so regular follow-up should be done after clearance to detect the decline of HCG, in addition to paying attention to the regularity of menstruation, the presence of abnormal vaginal bleeding, the presence of metastatic symptoms such as coughing and coughing up blood, and ultrasound, chest X-ray or CT examination when necessary. 4. Contraception should be used during the post-operative follow-up period of staphylococcal fetus. Previously, it was thought that pregnancy should be allowed only after 2 years, but now some people think that pregnancy can be considered 1 year after the conversion to negative. Ultrasound and HCG test should be performed in early pregnancy to know whether the pregnancy is normal or not, and HCG test is also needed after delivery until negative.