emome is a mobile value-added service brand for Chunghwa Telecom. There are several hundred value-added services in emome and the number of emome services keeps growing continuously. It's the basic demand to provide mobile value-added services that legal customers use the bought services correctly and suppliers providing services can receive the deserved remuneration. These functions must be set up on the mechanism of Payment. To provide emome members a simple and safe payment channel, we develop the Micro Payment System on the emome Authentication, Authorization and Accounting (AAA) framework and the system, which is called the [emome AAA Micro Payment System] , can be used over both mobile and Internet network. The [emome AAA Micro Payment System] has been on line providing services from October 2004. The main purpose of this paper is to introduce [emome AAA Micro Payment System] with the motive, demand, framework, function and flow.