Objective To study the value of double phase CTA scan of pulmonary artery and bronchial artery in the treatment of hemoptysis. Methods From 2014 to 2016, 35 patients with hemoptysis by interventional embolization were selected. All patients were underwented by CTA scan and interventional embolization before operation, Multi planar reconstruction (MPR), Maximum intensity projection(MIP), volume rendering (VR) and so on were performed on CTA, and multi angle rotation were combined to determine the feeding artery. The CTA examination of the blood vessels was confirmed by DSA and DSA as the gold standard. The data of the two groups were compared, to evaluate the imaging features of pulmonary artery and bronchial artery double phase CTA scan in the diagnosis of Pulmonary Hemoptysis, the detection coincidence rate (sensitivity) of different pathological changes of hemoptysis, the coincidence rate of the number of blood vessels (specificity) of hemoptysis and so on. Results The basic pathological changes of pulmonary artery and bronchial artery CTA double phase scanning imaging could fully observe the lungs, and pulmonary artery shunt signs, pulmonary artery source bleeding lesions. It had a high sensitivity (79.7%) and specificity (91.4%) for the detection of diseased vessels, but the result of inspect about body of pulmonary artery to the thin branch level of shunt, small pulmonary collateral arteries in the body was relatively poor. Conclusion The pulmonary artery and bronchial artery CTA double phase scanning imaging in hemoptysis interventional embolization could effectively found artery or pulmonary source bleeding lesions, it had high sensitivity and specificity for the detection of the blood vessel of hemoptysis, at the same time, it could be able to fully understand the opening and shape of the diseased vessels before operation, it could be used as a routine preoperative examination, so as to shorten the operation time and improve the surgical success rate of hemostasis, and to provide important guidance for surgical treatment.