There are two general choices for the location of pneumothorax cannula. In the first one, the traditional method is to select the affected side of the chest 2 cm lateral to the midline of the second intercostal clavicle, and a thinner deep venous puncture tube is commonly used, which is punctured and fixed as drainage. The advantage is that it is less invasive, the tube is thin, the patient suffers less pain, and the gas drainage from the top of the chest is smoother. The disadvantage is that the tube is thin, which is not conducive to drainage of pleural effusion and is prone to blockage and is not suitable for thicker chest drains because the pain will be more obvious. The second type is to select the 7th or 8th intercostal midline position on the affected side of the chest and often place a thicker chest drain. The advantage is that the tube diameter is thicker, less likely to be blocked, conducive to drainage, and the puncture hole can also be used as an observation hole for the thoracoscope during surgery, which is a multiple benefit. The disadvantage is that the trauma is slightly greater than that of a fine tube, and the pain is more obvious.