Through exploration of Internet of Things (IoT) and its system structure, a kind of Internet of Things application scheme is proposed for power transmission and transformation equipment monitoring system. The equipment information perception and monitoring process in the scheme are expounded based on equipment identification code; the service oriented panoramic information integration and information coordination method is used in the construction for panoramic information integration platform which has data layer, middle layer and application layer; modularization design method is employed in the design of IoT-middleware in the platform, and its components are designed and showed. Compared with the traditional one, this system has advantages of ensuring the reliable information interaction between equipment information perception and monitoring, the effective panoramic information integration and lean processing.