(1) Through the recent statistical analysis on accidents, a safety accident evaluation system for prefabricated buildings was established based on the principles of IAHP and TOPSIS. Based on the four primary aspects, which are human, object, environmental, and managemental factors, that determine the influence of the construction safety production of 12 sub-indicators, the IAHP-TOPSIS safety evaluation model was established to intuitively reflect on the comprehensive level of evaluation objectives. The model can comprehensively indicate the key points of safety management in building constructions and provide technical and theoretical support for safety management.