Abstract: Objective To investigate the quality of secondary water supply in Shanghai, in order to provide the basis for efficient management measures. Methods Secondary water supply data were collected and analyzed from Shanghai drinking water health inspection and monitoring information system. Results Cleaning and disinfection of secondary water supply facilities and water quality self-check and others were found to be low in pass rate. The drinking water quality of secondary water supply was lower. The main unqualified monitoring indexes were oxygen consumption, total number of bacteria and residual chlorine. Conclusion Several problems exist in secondary water supply. By using Shanghai drinking water health inspection and monitoring information system, we can take effective measures to achieve secondary water supply scientific supervision, then ensuring water safety.