The location of closed chest drainage of hemothorax is related to the position the patient can take and the amount of hemothorax. For patients who can sit or stand and have a small amount of hemothorax, the posterior back is usually taken for ultrasound exploration and localization, and then thoracentesis is performed for drainage, and the selected drainage tube is of thin caliber. For patients with a large amount of hemothorax or who cannot sit or stand, the site with less soft tissue on the lateral chest wall is used as the drainage location, and the patient is usually in a semi-recumbent position. The selected drainage tube is of thicker caliber and needs to be placed into the chest tube after percutaneous incision and blunt separation of the soft tissues of the chest wall. For patients with hemothorax combined with pneumothorax, the midline of the 2nd intercostal clavicle may be additionally selected as the drainage location to facilitate gas drainage, and the patient is usually in a semi-recumbent position.