The invention relates to a method and a system and especially to a JSON-based mechanism aged care data interaction method and system, and belongs to the technical field of mobile data interaction. According to a technical scheme provided by the invention, the JSON-based mechanism aged care data interaction system comprises a handheld terminal and an aged care server in aged care data interaction with the handheld terminal. The data interaction between the handheld terminal and the aged care server uses a JSON data format. The method and the system may simplify a data interaction mode, increase data transmission efficiency, and guarantee data communication safety.