Abstract: The purpose of this study is to assess the present situation about the overall performance quality of CT scanners from Second Level 2nd Class hospitals and private hospitals in Shanghai. The test and evaluation methods refer to Specification for Quality Assurance Test for Computed Tomography X-ray Scanners (GB 17589-2011). A total of 62 CT scanners from 59 hospitals were tested. The mean value of high-contrast resolution was 6.8 lp/cm, low contrast detectability was 2.4, CT number of water was 3.0 HU, noise was 0.43% and uniformity was 2.3 HU. In quality control tests, 20 of 62 CT scanners were qualified, and the percent of pass was only 32%. The equipment aging and lack of preventive maintenance were main reasons for performance degradation of CT scanners.