Patients with a cough accompanied by green sputum are more likely to have a bacterial infection and are advised to go to the hospital to complete routine blood tests. If the blood test indicates a left shift of the nucleus, elevated white blood cells, and a significant increase in calcitoninogen and C-reactive protein, a bacterial infection will be diagnosed. In this case, the patient can choose levofloxacin, roxithromycin, penicillin, cephalosporins and other drugs for treatment under the advice of the doctor. In addition, before using antibiotics, pay attention to the retention of sputum specimens to be able to perform sputum culture, which can be further treated according to the results of sputum culture. If the green sputum is caused by Pseudomonas aeruginosa, the patient needs to choose three generations of cephalosporins plus aminoglycosides, such as nedimycin, etimycin and other drugs or levofloxacin for combined treatment, if the ideal treatment effect is not achieved, you can choose to use levofloxacin combined with hydrocarbons for treatment.