Gestational diabetes is a type of diabetes mellitus typology, and the difference between it and diabetes mellitus is as follows: 1. The diagnostic criteria are different. The diagnostic criteria for gestational diabetes mellitus are fasting blood glucose greater than or equal to 5.1mmol/L, 75g glucose tolerance test 1h greater than or equal to 10.0mmol/L, 2h blood glucose greater than or equal to 8.5mmol/L. If it reaches any point of the above Gestational diabetes can be diagnosed if any of the above-mentioned indicators are reached. The diagnosis standard of diabetes is fasting blood sugar greater than or equal to 7.0mmol/L, oral 75g glucose tolerance test 2h blood sugar greater than or equal to 11.1mmol/L, random intravenous blood sugar greater than or equal to 11.1mmol/L, can be diagnosed as diabetes, gestational diabetes patients blood sugar diagnosis standard is lower than diabetes. 2, different treatment methods, gestational diabetes treatment can only The treatment of gestational diabetes can only apply insulin to control blood glucose, while diabetic patients, especially type 2 diabetic patients, can take oral hypoglycemic drugs to control blood glucose.