The present invention relates to platforms, systems, and application methods for data exchanges between systems based on data tag. The platform for data exchange between systems includes a service management system, a data tag management systems, an application terminal, and a service resource system. The data tag management system obtains service resource information from the service management system based on different applications, and generates data tags. The application terminal obtains the corresponding service resource information from the data tag, interacts with the service management system to obtain service result, thus achieving a variety of service applications. The disclosed system and method can effectively integrate a range of services, facilitate inter-system data exchanges, and improve user experiences, which allow tag data to be applied to the larger scale commercial applications. The disclosed systems and methods are easy to implement at low costs.