To summarize thepractice and experience of targeted food hygiene security measures in a major field activity of the army in order to provide references for diverse tasks. Considering the characteristics of heavy activity， field operations and the influence of COVID-19， a series of support measures related to food hygiene surveillance were strengthened. The first measure was review of recipes， health management and training of employees， procurement and storage of raw materials， warehouse management， processing and manufacturing management， disinfection of tableware， as well as food sample retention. Secondly， the control points that probably cause spread of COVID-19 in the phase of food service industry were analyzed， then relevant supervision and guidance were carried out from the aspects of employees and diners， foods of cold chain logistics， environment and emergency response plan. Finally， in order to assure the safety of food processing and crowd-gathered diet in the field， the following measures were guided to adopted including selecting the site of cooking and dining properly， cleaning the environment， making dishes using pure water and semi-manufactured foodstuff， keeping food sanitation in the course of transport and dinning， as well as supervising the robot machines for cooking automatically. The main experiences were listed as follows： promoting food safety awareness of the principal and the employees of the canteen， enhancing legal enforcement capacity and technical capacity of health supervisors， focusing on new risks related to food safety as well as reinforcing the management of health supervisors and employees in the field.