People with diabetes can get pregnant when they keep their blood glucose under reasonable control. Well-controlled diabetes does not significantly affect reproductive function. Active glycemic control is needed during preparation for pregnancy and during pregnancy to keep blood glucose within the target range, then there will be no significant effect on the pregnant woman or the fetus. Blood sugar is controlled by dietary adjustments, moderate exercise and, if necessary, insulin injections. However, if blood glucose control is unstable, adverse phenomena such as obstructed labor, pre-eclampsia, macrosomia, miscarriage and placental abruption may occur during pregnancy. Patients diagnosed with diabetes mellitus should actively cooperate with doctors for treatment. It is recommended to prepare for pregnancy after blood sugar control is stable, actively control sugar after pregnancy, and have regular medical checkups.