In view of the characteristics of prefabricated buildings,this paper teases the construction safety accidents and the causes through Fault Tree Analysis(FTA),summarizes the basic events to determine evaluation indicators,and thus constructs the evaluation index system for prefabricated building construction safety.Then the paper uses the Set Pair Analysis(SPA)to determine the index weight,and the gray clustering analysis method to evaluate the project's safety of prefabricated building construction and iden...