The insulin injection sites in order of fastest to slowest absorption are the abdomen, upper arms, outer thighs and buttocks. Since the abdomen is the fastest absorbing part of insulin, the clinically preferred routine injection site is the abdomen. When injecting, be careful not to choose the area around and above the navel for injection, but choose the side and below the navel one palm away for injection. When injecting, pay attention to sterilization, often change the injection needle, if a long time a part of the injection, it is easy to form subcutaneous nodules, so it is necessary to change the injection site in a timely manner. If there are too many skin nodules on the abdomen, you can choose the upper arm for injection. As the outer part of the buttocks and thighs are affected by movement and unstable to absorption, it is generally not recommended.