Abstract: Due to the particularity of the power system, many factors need to be considered during the construction process of 220 kV substations. Such as construction environment, safety assurance, industrial manufacturing quality, etc. In actual construction, a series of technical points must be reasonably planned and executed to ensure the smooth completion of the project and its acceptance. The article introduces the construction technical points of the 220 kV substation expansion project, hoping to provide reference for relevant personnel.