This paper introduces the intelligent linkage technology between substation video and environment surveillance system and power equipment monitoring & diagnosis center system. Using the unified common information model based on remote video and environment surveillance, the information fusion between the two systems i.e. video, environment information and production, running, on-line monitoring information is achieved. And through intelligent control linkage mechanism, the functions of video accessing, real-time monitoring, alarm linkage are realized. The practice proves that this intelligent linkage technology solves the problem of information silos, and achieves multi-dimensional intelligent monitoring and analysis of the power equipment through extended application of the “Fifth remote” — remote video.