Aiming at the shortcomings of traditional data aggregation scheme of power transmission and transformation equipment, such as waste of storage and calculation resources and incomplete data model, a panoramic information aggregation method for transmission and transformation equipment (TTE) based on CIM and REST is designed in this paper. Firstly, CIM defined in IEC 61970/968 is selected as the global model of TTE data, and modeling ideas of online and offline data are given respectively, which makes the data model more complete and unified. Secondly, a data aggregation mechanism based on REST is proposed to solve the problem of resource waste and improve maintenance efficiency and scalability of data platform. Finally, based on CIM model and REST aggregation mechanism, a panoramic information aggregation platform for TTE is established, and the practical application results are introduced in detail to provide a novel idea about equipment data aggregation.