Objective To provided reference for the disposal of similar incidents in the future， a food poisoning incident at a school in Changsha City was analyzed.Methods The epidemiologic characteristics of the incident was described， the suspicious food through case-control study was analyzed， food hygiene investigation and laboratory test to find pathogenic factors and contaminated food were conducted.Results A total of 54 suspected cases were found， and the clinical manifestations were mainly diarrhea （100%）， abdominal pain （92.59%） and fever （88.89%）. The incubation period of the disease was 2.5-51 h， with a median of 13 h. The case-control analysis showed that food sets of the Salt Crispy Chicken Shop between May 1 and 3， 2022 were suspected high-risk foods. Salmonella was detected in anal swab samples of 14 cases and 3 batches of food samples. The molecular typing analysis of the positive strains isolated by pulse gel electrophoresis showed that they came from the same source of infection and were all Braenderup type.Conclusion The incident was a food poisoning incident caused by Salmonella Braenderup infection， and the suspected food was boiled eggs. It is suggested that the Market Supervision Bureau should strengthen the supervision of restaurants， the restaurants should improve food hygienic knowledge and standardize the operation process.