With the increased awareness of insulin, controlling blood glucose with insulin has become more and more accepted by diabetic patients. However, some people’s blood sugar does not reach the ideal target after insulin injection, which is not only related to various factors such as poor diet control and insufficient exercise, but also closely related to poor insulin absorption caused by incorrect method, site and time of insulin injection. How can we make insulin absorption better? We should pay attention to the following aspects: First, the selection and protection of the injection site: generally insulin injection is appropriate in the more relaxed parts of the skin, such as the abdomen (2-5 cm outside the umbilicus), the lower edge of the deltoid muscle of the upper arm, the lateral muscle of the upper arm, the lateral muscle of the thigh, the buttocks and other parts. Clinical observation of some long-term insulin injections of patients friends commonly used insulin injection sites have hard knots or muscle atrophy, which is often caused by a long time in the same site of injection, which will make each injection of insulin can not be well absorbed, that is, the amount of insulin absorbed by the injected body application is less than the amount of injection. In order to reduce the above-mentioned situation and ensure the normal absorption of insulin, each insulin injection site should be separated by at least 2cm distance, and should not be injected again at the last injection site, so as to avoid malabsorption of insulin and reduce local muscle stiffness, atrophy and inflammation due to repeated injections. The rotation of injection sites can generally follow the following principles: first, choose the left and right symmetrical sites for injection, and rotate the injection left and right symmetrically. When the rotation is completed, the site should be replaced with another symmetrical site. Second, the rotation of injection sites within the same injection area should be regular to avoid confusion. For abdominal injection, draw two circles around the umbilicus, one with a radius of 5cm and one with a radius of 8cm, and divide the area between the two circles into 8 injection areas, and inject insulin within the injection area, and change the injection area each time in a clockwise direction. When injecting the upper arm or thigh, you can draw a line along the injection site, each line can be injected 4 to 7 times, and the distance between injection points is more than 2cm. Second, pay attention to the depth and angle of needle entry: insulin is injected by subcutaneous injection method, which ensures its stable absorption. Therefore, how to enter the needle becomes a problem in front of the diabetic patients. First, the depth of the needle should be mastered. If the needle is inserted too deep to reach the muscle layer, it will increase the pain of the injection and will accelerate the absorption of insulin, leading to unstable blood sugar control; if the injection depth is too shallow and only reaches the epidermal layer, it will lead to insulin leakage and may also bring pain or immune reaction. Secondly, the angle of the needle is also worth noting, and the angle of the needle varies from patient to patient. Thin people and children should pinch up the skin and enter the needle at an angle of 45 degrees; normal weight people, overweight adolescents and obese people should pinch up the skin in the thigh area and enter the needle vertically; obese people can enter the needle directly vertically in the abdomen. This can avoid children and lean patients from injecting insulin directly into the muscle layer, resulting in accelerated insulin absorption, thus avoiding pre-meal hypoglycemia or post-meal hyperglycemia. Finally, it should be noted that the injection angle of the needle should not be changed during the injection process to avoid damage to muscles, blood vessels or connective tissues. Thirdly, there should be a few seconds of dwell time after the injection: many people find residual insulin liquid beads on the needle when they pull the needle out after the insulin injection, which is due to pulling the needle out immediately after the injection. The correct practice should be to keep the needle under the skin for a few seconds after the injection to ensure that the injected dose enters the skin completely before pulling out the needle, so as not to affect the effect of blood glucose control because of the inaccuracy of the injected dose.