Bronchiectasis with infection is a chronic respiratory tract infection, most often seen in children with measles, whooping cough, bronchial asthma and other diseases, and in adults with bronchial cystic or columnar dilatation with infection, coughing, yellow-green sputum, blood in the sputum, and even fever. The most common bacterium of bronchiectasis with infection is Pseudomonas aeruginosa, which causes clinical manifestations such as coughing yellow-green sputum and even blood in sputum, and the diagnosis can be accurately indicated by sputum culture examination. However, bronchiectasis with infection can also present other nosocomial infection bacteria, such as Klebsiella pneumoniae, Escherichia coli, Acinetobacter baumannii, etc., and also Staphylococcus aureus infection. Bronchiectasis with infection is mainly considered Pseudomonas aeruginosa, which causes the clinical manifestation of yellow-green sputum, including some other nosocomial bacterial infections, which need to be further suggested by the results of sputum culture.