Through observing the level of blood glucose and pregnant outcomes of 120 pregnant women with gestational diabetes mellitus, which were randomly divided into the system health education group and traditional health education group, the article found that there was statistically significant before and after intervention of two groups, and the systematic education group is superior to the traditional education group. There were no significant differences in mode of delivery, birth weight, great children, pregnancy－induced hypertension, polyhydramnios, premature children, fetal distress of two groups, while systematic education group was significantly lower than traditional group in premature rupture of membrane and blood loss. As a result, the systematic health education in the pregnant women with gestational diabetes mellitus was helpful in control of blood glucose and obstetrical disease.