The invention discloses a system and method for applying a radio frequency identification tag in activity management. A radio frequency tag activity card has a unique identification code, the code is associated with user information and an activity code; a card reader reads tag information, tag location is determined by an algorithm, and the read information is uploaded to a central database of an activity control management center; then, a functional module is started, data is extracted from the central database, and services of real-time management, information transfer, activity assessment and the like are provided; when the activity is finished, the user information is permanently stored in the central database; and if the user participates in a new activity, the tag, the user and a new activity code are associated. In the invention, the unique identification code is provided by the radio frequency tag, so that an activity participant is associated with a real activity. Thus, space and time data of the radio frequency identification tag are read in real time, and the system stores the information which is subjected to further algorithm analysis and processing, thereby providing a reliable data resource for security protection, real-time decision making, statistic analysis and data mining.