Clinically, in order to diagnose pulmonary artery disease, pulmonary arteriography can be done, the operation mode is mainly under local anesthesia for femoral vein puncture, from the right atrium, right ventricle will be inserted into the tip of the catheter into the main trunk of the pulmonary artery, so as to carry out the imaging. Pulmonary arteriography can clarify many lung diseases, the operation steps: 1, inform the patient and family members of the role of the operation, the purpose, complications and adverse reactions. 2, before the operation to improve the electrocardiogram, chest radiographs, CT, bronchoscopy, as well as liver and renal function of the examination. 3, do not eat or drink for 4 hours before the pulmonary arteriography. 4, good preparation of the puncture site of the skin. 5, wear a monitor, the establishment of intravenous access, local anesthesia. 6, puncture at the femoral vein. 6. Introduce the catheter by puncture at the femoral vein, put the tip of the catheter from the right atrium and right ventricle to the main trunk of the pulmonary artery, inject the contrast medium in the median or lateral position, pull out the catheter, and apply pressure for 10 minutes and then apply pressure bandage.