The first point to be noted is the correct position of the patient. The patient should be in the prone position, which facilitates palpation of the femoral artery. Next, the patient should be disinfected in the area of the groin, and the femoral artery should be located. For general puncture, the femoral artery should be located in the area around the groin, or you can use ultrasound to locate it before puncturing it, which will increase the accuracy significantly. When puncturing, special attention should be paid to the angle of the puncture. Generally speaking, the angle of the puncture needle is best at about fifteen degrees, and if there is a bright red blood return, it means that the puncture is successful.