Objective: To explore the application value of routine auxiliary diagnosis technology for COVID-19 pneumonia in the community population after the pandemic was fully lifted. Methods: The data of positive for viral nucleic acid or antigen positive in three hundred and thirty cases of COVID-19-infected persons in the fever checkpoints from December 12, 2022 to January 20, 2023 were analyzed, among them males were 123 cases, females were 207 cases, and the average age was 14~95 years old. The abnormal characteristics of chest X-ray inspection(CXR) and blood routine indicators were analyzed. Results: CXR examination showed that 146 cases were consistent with the signs of viral pneumonia, and the positive rate was 44.2%. The mild pneumonia was 69.17%, and moderate pneumonia 30.82%. There was no significant difference in the incidence rate in COVID-19 pneumonia at the different ages(P>0.05). There were differences in the risks of incidence of COVID-19 pneumonia in the peripheral blood lymphocytes decrease, normal, and increase three groups(P<0.05). Elevated proportion of C-reactive protein was higher in the pneumonia group than that in the un-pneumonia group and the difference was significantly different(P<0.05). Conclusion: Peripheral blood lymphocyte count can be used as biological indicators for early prediction, classification, and evaluation of disease outcomes; elevated C-reactive protein to reactive pathological changes was the important indicator to assess the course and severity of the illness; changes in peripheral blood leukocyte index can effectively raise the sensitivity of diagnosis of mixed infection types. Chest digital radiographic imaging technology can meet the basic medical clinical requirement. Conventional auxiliary diagnostic technology has certain clinical application value in screening and diagnosis of COVID-19 pneumonia.