Taking small-scale infrastructure projects in the power industry as the research object, this paper combines the DEMATEL and ISM methods to explore the relevant factors that influence the implementation of digital-twin-based smart construction and obtains the key factors and influencing path among factors under analysis. In this paper, the MICMAC method is used to categorize the factors and analyze the influence and dependency relationships among the factors in the system. On the basis of research results under integrated model analysis, the paper provides suggestions on how to successfully implement smart construction in small-scale infrastructure projects in the power industry.