Abstract: As the largest sub-project in construction engineering, intelligent building is the embodiment of human scientific and technological development achievements in construction engineering. From the perspective of dimensionality, this article innovatively constructs a three-dimensional management model, which is three dimensions of object, method and time. By analyzing each dimension, it analyzes the shortcomings of project management theory, and introduces the role of the third dimension of time in project management. It enriches the engineering project management theory with the characteristics of intelligent buildings.