Since the hidden costs of construction projects are subtle and strong, difficult to quantify, it has not yet resulted in completing research system. This paper analyzes the literature to identify the concepts and forms of hidden costs, then summarizes the factors affecting the construction of 20 projects in hidden costs. Factor analysis extracted six comprehensive factor variables to represent the most influential factors, propose appropriate measures to control construction projects of hidden costs, and lay the foundation for further quantifying the hidden costs for these factors.

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