Abstract: The development of smart site is of the great significance in achieving the digitization of construction projects and moving towards the fine management of industrial level. To promote the development of smart site, and to sum up the main obstacles to affect smart site development, it combines with the expert opinions and questionnaire, identify the strong driving force in the obstacle factor system based on FISM and MICMAC method, reveal the action path of each factor. The results show that there are 12 main obstacles to the construction of smart sites, and they are being divided into four levels. The four factors' driving force is strong: government impetus, core technology maturity, the size and complexity of the project, and the perfection of the standard. The government drive and core technology can promote the development of smart sites.