Signs of improvement of pneumonia are mainly manifested in the following aspects: 1) The patient’s self-perceived symptoms will obviously improve, such as body temperature will be reduced to normal, cough, sputum, chest pain symptoms will obviously disappear, relieve. 2) The wet rales in the lungs can be obviously absorbed and improved. 3) Blood tests, blood routine, C-Reactive Protein, Calcitonin, and other inflammation-related indexes are obviously reduced compared with the normal value. 4) Review of CT can see that the infected foci in the lungs are obviously reduced and absorbed. Lung CT can see that the infected lesions in the lungs are significantly reduced and absorbed, and the above points can be taken as signs of improvement of pneumonia. Pneumonia once diagnosed should be actively treated to avoid delays.