Huxi Substation Foundation Project is featured by many pile types, a number of piles, being close to an operating substation, complicated process and long duration. This paper discussed in detail the necessity of pile foundation construction monitoring, monitoring items, monitoring requirements, the actual records of monitoring and the corresponding control measures, as well as described the monitoring items such as excess pore water pressure, deep soil displacement and pile top displacement and ground displacement, which could provide guidance to the pile construction.