Background: In December 2019, a cluster of patients with pneumonia of unknown cause was linked to a seafood wholesale market in Wuhan, China. A novel coronavirus was detected, capable of infecting humans, on 6 January 2020 and termed COVID-19. By 16 February 2020, there were 51857 confirmed cases with 2019-nCoV (COVID-19) pneumonia in 25 countries. COVID-19 can also lead to acute respiratory distress syndrome (ARDS).Methods: 149 patients with 2019 Novel Coronavirus (COVID-19)pneumonia(68 males,

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... 81 females, ages 1-89)from 6 research centers in China were diagnosed with positive 2019 Novel Coronavirus(COVID-19)nucleic acids antibodies. And their high-resolution computed tomography(HRCT) imaging datas were evaluated.Results: 136/149(91.3%)patients had a clear history of exposure to Wuhan. Fever (122/149, 81.9%)and cough(83/149, 55.7%)were the most common symptoms. The main imaging characteristics within 4 days of onset included 30(20.13%) cases of pure ground glass opacities (P<0.05), 38(25.50%) cases of GGO with reticulation(P<0.01), 12(8.05%) cases of consolidation(P<0.01). In the 5-8 days group, the main imaging features included 71(47.65%) cases of pGGO(P<0.05), 69(46.31%) cases of GGO with reticulation(P<0.01). In the 9-12 days group, the main feature was 85(57.04%) cases with GGO with reticulation(P<0.01). In the group of 13-16 days group, the main imaging characteristics included 48(32.21%) cases of GGO with reticulation(P < 0.01), 34(22.82%) cases of consolidation(P<0.01).Conclusion: Patients infected with COVID-19 pneumonia show more chest CT characteristics within 5-8 days after the onset of disease. The main manifestations included pGGO, GGO with reticulation, consolidation and GGO with consolidation.