Objective To provide a scientific reference for improving the investigation methodology and the quality of survey reports by examining the reports on foodborne disease events in Sichuan Province from 2015 to 2021.Methods According to National Foodborne Disease Outbreaks Surveillance System， reports on foodborne diseases （with more than or equal to 10 cases）， in Sichuan Province， from 2015 to 2021 were collected. The reports were evaluated using 39 key indicators following the relevant guidelines and references.Results This analysis included 259 reports. The quality score of the reports ranged from 9 to 34 （median = 23）. The average score of the reports from 2015 to 2021 showed an evident increasing trend （r = 0.964， P < 0.001）. However， there are some notable concerns. In particular， 53.67% of the reports did not calculate the incidence rate， 50.97% did not include clinical feature proportions， only 25.10% utilized the epidemic curve， and only 16 reports provided an analytical epidemiological investigation. Moreover， 66.02% of the reports did not investigate the suspected food processing process， while only 23.94% analyzed the causes of food contamination. The proportion of reports that took water samples， environmental samples， and biological samples from relevant employees was all less than 40.00%. Only 58.69% demonstrated accurate conclusions in their reports. Furthermore， 44.79% of the reports did not ascertain a pathogenic factor， and 60.62% did not identify the source of contamination. Additionally， 32.43% of the reports were logically confusing， and only 42.47% adhered to the correct reporting format.Conclusion Epidemiological investigations and the quality of the investigation reports on foodborne diseases from the Center for Disease Control and Prevention in Sichuan Province warrant further improvement across all levels.