Abstract: With the development of power Internet of things technology, the popularization and promotion of business, the demand and dependence of various professional applications on communication network are also increasing. The electric power infrastructure project site is subject to the objective factors such as topography and site conditions. There is a blind area in the network communication coverage. The bottleneck problem of "the last kilometer" of data transmission has been restricting the construction of infrastructure information system and the development of supporting communication system projects. This paper analyzes the characteristics of capital construction projects and the field business of capital construction projects, provides the basis for selecting the networking mode, and makes a detailed study and analysis of the existing information transmission modes and key technologies such as power private network, public network, satellite and deep coverage access on the site of capital construction projects. On this basis, it gives the typical networking mode of the site of capital construction projects, which provides a useful reference for the related research.