If the patient wants to find the location of the second intercostal space in the midclavicular line, he or she can do the following: First, first, find the midpoint of the clavicle on one side. If the patient is not skilled, he can use a ruler to measure and find the midpoint of the clavicle on one side, and then make a vertical line down through this point, which should be perpendicular to the ground and parallel to the long axis of the body, noting that the patient is in an upright position at this time. If the patient finds it troublesome, he can first make a line parallel to the long axis of the body through the sternum, and then make a parallel line through the midpoint of the clavicle. Secondly, to find the location of the second intercostal area, it is recommended that the sternal angle be found first, that is, there is an obvious corner in the middle of the thorax where the bones are more on the upper side, after touching this corner to the left and right sides is the second rib, below the second rib is the second intercostal space, the intersection of this intercostal space and the line made is the location of the second intercostal area in the clavicle.