The location of internal jugular vein puncture is divided into anterior, middle and posterior approaches. 1. Anterior approach: Internal jugular vein puncture requires the patient to lie down, let the patient’s head turn to the opposite side, and find out the triangle formed by the clavicular head of the sternocleidomastoid muscle, the sternal head, and the clavicle, and the top of this triangle is the puncture point. 2. Middle way: Take the intersection of the line between 3 cm above the patient’s clavicle and 3 cm beside the median line as the puncture point, the needle and the patient’s skin are at an angle of 30 to 45 degrees, and the tip of the needle is pointed to the ipsilateral nipple, and it is often used to enter the vein in the middle and posterior part of the sternocleidomastoid muscle. 3. Posterior approach: The lower end of the sternocleidomastoid muscle, the sternal head and the clavicular head, and the upper edge of the clavicle form a triangle, which is the sternocleidomastoid triangle, and the internal jugular vein is located in the center of this triangle. When the patient needs internal jugular vein puncture, it is recommended that the patient be operated by a professional doctor to avoid serious consequences.