Blood glucose level alone cannot determine the dose of insulin to be injected. It is usually necessary to monitor the blood glucose level for one day, including fasting blood glucose and blood glucose after three meals, and then calculate the amount of basal and mealtime insulin to be injected respectively. 1. The amount of insulin is divided into basal insulin, mealtime insulin, and adjusted insulin. At the beginning, it is necessary to determine the amount of basal insulin and the amount of mealtime insulin to be given before each of the three meals. Calculate the amount of basal insulin: (100 – blood glucose) × kilogram body weight × 6 ÷ 2000. If the patient weighs 60 kg, the amount of basal insulin is (100-15) × 60 × 6 ÷ 2000 = 15.3 units. The amount of insulin injected before three meals is generally 0.05-0.1 U/kg, and then according to the daily monitoring of fingertip blood glucose, by checking the situation of blood glucose control and then determine the adjustment of the amount of insulin, the amount of adjustment is generally adjusted by 10%-20% of the original amount. 2. Basal insulin is usually injected subcutaneously at 20:00 in the evening to maintain the blood glucose value at night; preprandial insulin is usually injected before meals to control the blood glucose elevation brought by diet. With elevated blood glucose, it is recommended to use insulin under doctor’s guidance to avoid hypoglycemia.