Legal basis: According to the Second Implementation Plan of Pregnancy Risk Assessment and Management of Pregnant Women in Qingdao, medical institutions that carry out pregnancy risk assessment of pregnant women should use five colors of "green (low risk), yellow (general risk), orange (high risk), red (high risk) and purple (infectious disease)" according to the severity of the risk, and stick color labels at the corresponding positions in the instructions. (1) Green sign: low pregnancy risk. The basic condition of pregnant women is good, and no pregnancy complications or complications have been found. (2) Huang Zheng: The risk of pregnancy is average. There are some risk factors in the basic situation of pregnant women, or they have pregnancy-related complications, but their condition is mild and stable. (3) orange sign: high risk of pregnancy. The pregnant woman is ≧40 years old or has a body mass index ≧28, or has serious pregnancy complications, which poses a certain threat to the safety of mother and baby. (4) Red sign: high risk of pregnancy. Pregnant women suffer from serious pregnancy complications, and continuing pregnancy may be life-threatening. (5) Purple logo: pregnant women suffer from infectious diseases. Pregnant women with purple signs may be accompanied by risk signs of other colors. For pregnant women with "orange" and "red" risk assessment, medical institutions shall fill in the "Classification Report Form for Risk Assessment of Pregnant Women" (Annex 5) and submit the report form to maternal and child health care institutions within 3 days and 24 hours respectively.