The common complications of central venipuncture are as follows: 1, bleeding and hematoma: because the artery is adjacent to the vein, there is a higher chance of accidental injury to the artery during the operation, and the chance of bleeding and hematoma will be relatively increased because of the high pressure of arterial blood, and patients with poor coagulation function are also prone to hematoma; 2, pneumothorax and hemothorax: when the subclavian vein is punctured and the interlung is damaged, a limited pneumothorax will occur, which will cause respiratory distress in severe cases. Early thoracic decompression is needed. If the artery is mistakenly injured during the subclavian vein puncture and the pleura is punctured, the blood will flow into the chest cavity through the breach, forming a hemothorax; 3.Ventricular fibrillation: the position of the guidewire or catheter is too deep, which may stimulate the heart and cause ventricular fibrillation, so the puncture must be performed under cardiac monitoring. 4.Infection: for patients with poor aseptic technique and multiple punctures, the chance of contamination can be increased, leading to post-puncture infection, the incidence of which The incidence can be as high as about 6%.