Fasting blood sugar of 6.3 mmol/L is considered high and needs to be controlled by diet or medication etc. If the postprandial blood sugar is 6.3mmol/L, it is not high and does not need to be controlled. Normal people’s fasting blood sugar is 3.9~6.1mmol/L, if the fasting blood sugar is 6.3mmol/L, it is high. If it is caused by diabetes, you should pay attention to your diet and limit the intake of sugar to avoid the rise of blood sugar. At the same time, oral hypoglycemic drugs such as metformin, gliclazide, gliquidone, etc. should be taken under doctor’s supervision. If postprandial blood glucose is 6.3mmol/L, it is not considered high, it is a normal condition and does not need to be controlled. If necessary, you can go to the regular hospital, relevant examination, with the doctor standardized treatment. Pay attention to diet and exercise.