To set up the model for evaluation of the food safety supervision on large-scale event. Methods The safety level of food producers was evaluated by Delphi method. The other factors which might affect food safety such as age and personnel source were screened and identified. The evaluation model of composite index was developed by analytic hierarchy process. Results The model was constituted of 5 dimensions (age, weather, personnel source, food type and the producer's safety level) in a large-scale event. The scores weight were 3.96%, 9.85%, 7.14%, 35.99% and 43.06%, respectively. The score of alert for restaurant was 60,8 for fast food services, and 59 outdoor catering. Conclusion This study was helpful for supervision department to conduct food safety risk assessment and choose safe food producers and ensure food safety in a large-scale event.