Abstract:OBJECTIVE To investigate and analyze the cause of the food poisoning incident in the itinerant stall by nitrite in or⁃ der to provide evidence for taking effective measures of prevention and control and to prevent similar events. METHODS The field epidemiological investigation, a hygiene survey and laboratory detection was carried out through trace-back studies and analyzed the possibility of pollution. RESULTS The main Clinical symptoms were nausea, dizziness and diarrhea followed by vomiting, weakness and cyanosis, the incubation period was 45 minutes.They were quickly relieved after treatment with methylene blue. The nitrite was detected in different condiment and also detected in the gastric juice and urine of the patient. CONCLUSION It was identified as a food-borne nitrite poisoning incident. The relevant departments should strengthen the supervision of the itinerant stalls and supervi⁃ sion of food additives especially for the nitrite. The nitrite knowledge education of the food safety should be strengthened to specific employees who engaged in the food industry.