The construction of intelligent substation and the development of smart grid have put forward higher requirements to the intelligence of high-voltage electric equipments. The on-line monitoring and diagnosis technology is a critical part of intelligent substation construction, however, the conventional data processing methods now are difficult to satisfy the needs of monitoring, because of the large number of t monitoring types, the large amount of data processing, and the imperfect technology of structured communication between each level. Based on the summary of existing pretreatment technologies of field analysis for condition monitoring data, some cases of the integrated structure of communication network for condition monitoring data, the collection and sharing of terminal data, as well as the data transmission model after pretreatment are studied. Finally, some experience and improvement measures are presented for the optimization of parallel processing technology for condition monitoring data, in order to more reasonably realize the unified collection and process of condition monitoring data in intelligent substation, and provide help for the better analysis and use of monitoring data.