Wang has type 2 diabetes and never adjusts his own insulin dose, but he doesn’t go to the doctor to adjust it either, but gives it to his wife. Wang is usually busy at work, socializing more, originally the doctor suggested that he inject insulin when he was not happy. Later, he heard people say that insulin injections can be adjusted by themselves, eat more, eat less, feel very suitable for themselves, so they asked the doctor to set a program, go home and let his wife learn to play for themselves, in his words, can not do it for themselves. The doctor’s plan for Wang is to inject premixed insulin twice a day. Wang is busy at work and usually does not monitor blood sugar, his wife forced to test once, almost every time the test is high, so the insulin dose is constantly increasing. Over time, Wang often felt panicky during the day and wanted to find something to eat, and when he was panicking, he had an electrocardiogram and found nothing wrong. He went to the hospital every few months to test the glycosylated hemoglobin, are below 7.0%, asked the diabetic patients around, said that the blood sugar control is not bad, the old Wang also did not take it seriously. After two or three years, once he suddenly fainted at work and was sent to the hospital, his blood sugar was so low that it could not be measured. Reviewing his medical history, Wang’s mistake was that he did not follow up with his doctor regularly, and he lacked knowledge about diabetes. The high blood glucose monitoring value and the glycosylated hemoglobin value were within the standard range, which did not match, indicating that the blood glucose must fluctuate more and the frequency of hypoglycemia was higher. Of course, it does not mean that diabetic patients receiving insulin therapy have no freedom at all. Generally speaking, insulin can have a free adjustment range of 2 to 4 units per day. However, patients must pay attention to the following matters: 1. After adjusting the dose, blood sugar must be monitored and recorded so that lessons can be learned later; 2. Adjusting the dose should not be too frequent. Measures are only needed if the blood sugar is high or low at a fixed time all this time, and the dose should not be adjusted hastily once the blood sugar is seen to fluctuate. In other words, if high blood sugar or low blood sugar is detected, the first thing to do is to look for the cause, rather than rushing to adjust the insulin dose, otherwise it is likely that the situation like the old king will occur; 3. If you want to eat more one day and temporarily increase the insulin dose for fear of high blood sugar, it is not impossible to do it occasionally, but this kind of thing should be done as little as possible. Because the situation of blood sugar is affected by various aspects such as diet structure, emotions and exercise, one success cannot be used as a practice, and the long-term excess calorie intake will also cause weight gain, further increasing the dose of insulin, leading to a vicious circle and aggravating the development of cardiovascular complications.