Coronavirus disease 2019 (COVID-19) has become a global public health emergency worldwide. Computerized tomography (CT) is very important for the diagnosis and differential diagnosis of COVID-19, understan-ding the imaging manifestation of COVID-19 will help to improve the accuracy of diagnosis. The main lung imaging manifestation of COVID-19 is ground-glass opacity, this paper describes the imaging manifestation of lung infectious diseases mainly shown as ground-glass opacity, imaging differences in pneumonia caused by coronaviridae, non-coronaviridae and other pathogens were compared, so as to help radiologists and clinicians make better clinical diagnosis and differential diagnosis.