Abstract: Objective:To analyze the value in the first clinical and chest CT features of Corona Virus Disease 2019(COVID-19). Methods:The first clinical symptoms、general inflammatory indicators and chest CT features of 90 patients with clinically diagnosed COVID-19 were retrospectively analyzed, which included 13 cases of severe/critical type and 77 cases of light/ordinary type. The results were analyzed and compared by two experienced radiologists. Results:Compared with the light/ordinary COVID-19 patients, the most important clinical characteristics of the severe/critical type were older age, general inflammatory indicators increased, and chest CT showed higher pulmonary inflammatory index(PII). The receiver operating characteristic curve(ROC) showed that the sensitivity of C-reactive protein(CRP) and PII to distinguish between severe/critical COVID-19 and light/ordinary COVID-19 was respectively 69.2% and 69.2%; The specificity was 83.1% and 87.0%, respectively; The Area Under Curve(AUC) were 0.77595% CI(0.649, 0.901); P=0.002 and 0.77095% CI(0.621, 0.920); P=0.002, respectively. The AUC of their association was 0.78595% CI(0.644, 0.927); P=0.001. Conclusion:Clinical symptoms, inflammatory indicators and chest CT features were significantly different between severe/critical COVID-19 and light/ordinary COVID-19 patients, and it is helpful for early identification of severe/critical COVID-19 and assessment of its prognosis when combined with age, PII and CRP.