Since collaborative,planning,forecasting,and replenishment(CPFR) was first proposed in 1998,numerous studies have focused on exploring its implementation in retailing contexts.While a considerable body of research has emphasized reduced costs,increased sales and improved forecasting ability,there has been a lack of research on the importance of each of the various factors which affect such implementations.In order to find out the critical success factors affecting CPFR implementation,this paper first collected related influence factors regarding adopting CPFR or business to business(B2B) information systems,and further constructed a factor table with a three-layer hierarchical structure.A pair wise analytic hierarchy process(AHP) questionnaire was designed and distributed to experts who were familiar with implementing CPFR in the retailing industry.After questionnaires were returned,we found out the weights of each impact factor by using a fuzzy analytic hierarchy process(fuzzy AHP) approach.The importance of each critical impact factor was investigated,and the paths of the critical success factors were also analyzed.The results of this study can provide more precise information with regard to allocating optimal resources for retailers implementing CPFR. Since collaborative, planning, forecasting, and replenishment (CPFR) was first proposed in 1998, numerous studies have focused on exploring its implementation in retailing contexts.While a considerable body of research has reduced reduced costs, increased sales and improved forecasting ability, there has been a lack of research on the importance of each of the various factors which which such so implementations.In order to find out the critical success factors affecting CPFR implementation, this paper first collected related influential factors versus adopting CPFR or business to business (B2B) information systems, and further constructed a factor table with a three-layer hierarchical structure. A pair wise analytic hierarchy process (AHP) questionnaire was designed and distributed to experts who implemented familiar with implementing CPFR in the retailing industry. After questionnaires were returned, we found out the weights of each impact factor by using a fuzzy analytic hierarchy process (fuzzy AHP) ap proach. importance of each critical impact factor was investigated, and the paths of the critical success factors were also analyzed. results of this study can provide more precise information with regard to allocating optimal resources for retailers implementing CPFR.