Unstable blood sugar needs to pay attention to the following points: 1. strictly control the diet, eat less and more meals, avoid overeating, avoid spicy, fried, sweet and pickled food, avoid tobacco, alcohol, carbonated drinks, coffee, etc., drink more plain water, bitter tea, chrysanthemum tea, etc.; 2. properly participate in physical exercise, do not do strenuous exercise; 3. keep a calm mind, avoid emotional fluctuations, ensure sufficient sleep, and keep bowel movements smooth; 4. stop taking oral hypoglycemic drugs and change to insulin injection therapy; 5. need to check the changes in blood sugar before three meals, after three meals and before bedtime, and adjust the insulin dose in a timely manner; 6. actively treat complications and comorbidities of diabetes.