Abstract: This paper establishes an analytic framework and systematic design discipline that feasible for mobile payments security (MPS) risk assessment. Then a web-based MPS risk assessment system is designed integrally and systematically. It utilizes fuzzy ANP and entropy technology to build the decision model. The system is capable of addressing multiple qualitative judgments with quantitative support, which is accomplished through the development and use of a framework in a web-based fuzzy decision making environment.