1.Insulin injection method: Select the injection site and disinfect the skin of the injection site with alcohol cotton balls. When injecting, use one hand to gently pinch the skin of the injection site 2 to 3 cm wide and cause slight pain, hold the insulin syringe with the other hand, stab the needle into the injection site quickly at an angle of 45° to 90°, push the liquid, and then relax the raised skin. Thin people and children are injected at an angle of 45°, and fat people are injected at an angle of 90°. After injection, pull out the needle quickly, do not change the direction when pulling out the needle, and compress the injection site with a clean cotton ball for 5-8 seconds, but do not rub. Throughout the injection process, keep the muscle relaxed. If the dose of a single injection is greater than 40u, divide it into two injections The best interval between injections in the same site is more than 1 month. 2. Reuse of syringes: The reuse of syringes for insulin will cause burrs and barbs on the needles and increase the pain during injection, so it is better not to reuse them. Such as poor economic conditions can be used repeatedly, but must pay attention to the following points: (1) can only be used repeatedly by myself. (2) The syringe must be capped when not in use. (3) Do not let the needle touch any other objects except clean skin and insulin stopper, otherwise it needs to be replaced. (4) Do not use the needle after it has been bent or blunted. (5) Do not wipe the needle with alcohol. (6) Minimize the number of repeated uses and do not use repeatedly more than 10 times or 3 days. (3) Tips to reduce pain during injection: (1) insulin should be brought to room temperature; (2) alcohol to be disinfected skin evaporates; (3) no air bubbles in the syringe; (4) enter the needle quickly; (5) do not change the direction when entering and removing the needle; (6) muscle relaxation; (7) change the injection site; (8) minimize the number of times the syringe is reused.