Abstract: The affecting mechanism of ERP on enterprise performance is discussed.The benefits of ERP are divided into tangible and intangible benefits.The Hochstrasser model is selected to analyze the uncertainties of tangible benefits in the process of an ERP project.An ERP value creation index model is developed to evaluate the intangible benefit of an ERP project,in which nine critical drivers of non-financial performances are listed which include enterprise innovation,brand and environment,etc.Furthermore,fuzzy method is employed to assess intangible benefits of ERP.In order to pilot this approach,a case study is implemented in clothing industry.The outcome of the research provides a new approach to effective assessment of the value of an ERP project and is helpful for managers of ERP projects to make decisions rightly.