In order to study the influence factors of prefabricated building cost in depth,the whole life cycle index system was constructed from five stages of decision-making,design,production,construction,operation and recovery.Combining the fuzzy interpretative structural model(FISM)with the analytic network process(ANP),the FISM-ANP model was established to analyze the influence factors of prefabricated building cost.The results show that the model cannot only qualitatively find out the surface direct factors,middle dynamic factors and deep guiding factors that affect the prefabricated building cost,but also express the internal logic relationship among the factors in the formofvisualgraph.Inaddition,it can also quantitatively rank the importance of the influence factors of prefabricated building cost,and find out the key stages and factors that affect the cost.