Men with diabetes have some impact on fertility, mainly from two aspects. On the one hand, a long course of diabetes can cause neuropathy, leading to male impotence, premature ejaculation, or decreased libido problems. On the other hand, diabetic patients are in a state of high blood sugar for a long time, which can lead to a significant decrease in the quantity and quality of male sperm and eventually lead to the problem of male inability to have children. Therefore, for men with diabetes, if they are preparing to have children, they should keep their blood sugar under very good control, fasting blood sugar should be 5-6 mmol/L, and two hours after meal blood sugar should be less than 8 mmol/L. Under this state of blood sugar control, it is possible for men with diabetes to have a relatively healthy baby.