Abstract: For the sake of preventing the metro construction safety accidents, the formation mechanism of and factors influencing unsafe behavior of metro construction workers were studied by means of theoretical analysis and practice investigation considering the complicated characteristics of metro construction. Firstly, the formation mechanism was analyzed based on behaviorism and cognitive theory and behavioral binding theory. Then, combined with the questionnaire survey, the EFA was used to simplify and reduce the original data. Finally, an SEM was built to explore the causal relationship between the influence factors and unsafe behavior of metro construction workers. The results show that the unsafe behavior of metro construction workers is the result of interaction between stimulus factors and constraint factors, and that both the working environment and psychological state have the greatest impact on it, and experience and skills have minimal impact on it.

Key words: metro construction workers, unsafe behavior, exploratory factor analysis(EFA), formation mechanism, structural equation model (SEM)