Theoretically, it is not recommended that pregnant women in their sixth month of pregnancy take the long-distance bus, the reasons are divided into three aspects: 1, time factor: the long-distance bus trip is generally farther away, the driving time is longer, pregnant women keep a posture for a long time will cause physical discomfort. In addition, a long time sitting position will cause obstacles to the circulation of the lower limbs of pregnant women, leg edema and other symptoms, increasing maternal fatigue as well as the physical burden; 2, environmental factors: the coach car space is limited, more people, air circulation is not smooth, easy to lead to pregnant women breathing suffocated, uncomfortable. In addition, this nearly closed carriages, is a favorable condition for the spread of respiratory diseases, in order to pregnant women as well as the safety of the fetus, pregnant women should avoid prolonged periods of time in this environment; 3, the state of the pregnant woman: generally speaking, the uterus in mid-pregnancy is more stable, but if there is abdominal pain, bleeding and other symptoms of preeclampsia, the pregnant woman should consult a doctor in time to be treated positively, and in the long-distance bus, the handling of this kind of emergency situation , will be limited.