The usual locations for muscle injections are gluteus maximus, gluteus medius, gluteus minimus and deltoid muscle of the upper arm, as well as the lateral femoral muscle injection method. The positioning of the above methods in medicine are as follows: 1. For gluteus maximus injection, the cross positioning method is usually applied, that is, a horizontal line is drawn from the apex of the gluteal cleft to the left and to the right, and then a vertical bisector is made from the highest point, and 1/4 of the outer upper quadrant is used as the injection site for positioning. 2. For upper arm deltoid injection, the outer side of the upper arm is taken from the peak of the shoulder downward 2-3 cm, and then positioning is performed to inject the upper arm deltoid. The lateral femoral muscle is injected by taking the lateral side of the upper arm 2-3 cm down from the peak of the shoulder and then positioning the upper arm deltoid. 3.