Belly subcutaneous needle injection generally refers to abdominal subcutaneous injection, abdominal subcutaneous injection methods include extracting medication, fixing the needle bolus, injecting medication, etc., and its location is usually selected within 5cm around the umbilicus. Subcutaneous injection refers to the injection of medication into the subcutaneous tissue, commonly used injection sites include the lower edge of the deltoid muscle of the upper arm, the abdomen and so on. Before subcutaneous injection in the abdomen, it is necessary to check three times and eight times, and then extract the medicine, after exhausting the air, hold the syringe in the right hand, fix the needle plug with the index finger, and within 5cm around the umbilicus, select the appropriate site, bevel the needle upward and the skin at an angle of 30~40 degrees, and rapidly pierce the needle 2/3, and then push the medicine all the way in after pumping back without any blood. If the patient’s subcutaneous fat is less, it is necessary to pinch up his/her abdomen before injection. After injection, if there is any discomfort, the doctor should be informed immediately.