Abstract: With the development of new technologies, e.g. Internet of Things (IOT), cloud computing and big data, China has been promoting the in-depth advanced integration between informationization and industrialization. To satisfy the urgent need, the key factors to enterprise transformation and upgrading is the smart enterprise platform. In this paper, the development of information management platform of CNOOC Gas & Power Group was described. First, the architecture of smart enterprise platform which is interactive in 3D space was proposed according to the construction principle of heavy platform and convenient application. Second, several intelligent systems were developed by using the pipeline data fusion and the 3D emergency decision-making support technology, including production data acquisition, intelligent video surveillance, safe production/operation management and mobile application, and intelligent energy saving management. Third, based on the technologies of IOT, cloud computing, big data and mobile application, the factory/field WLAN and the enterprise energy-saving and emission-reduction system were developed, the data center was built up and the cloud-architecture monitoring support platform was integrated. The platform is remarkably scientific, advanced and intelligent. The practical application of smart enterprise platform in CNOOC Gas & Power Group shows that it can promote the reformation of production and management modes overall, increase the level of safety & environmental protection, energy saving & emission reduction and green low-carbon, and improve labor efficiency and production benefit.