Abstract: Mobile Ad Hoc Network (MANET) can be applied into telecommunication access networks, so it is necessary to research the charging technology of Mobile Self-organizing Internet (MSOI: The convergence network of the MANET and the Internet). Firstly, the study concludes the charging mechanism of the traditional network can not be directly used in MSOI, because the information of online user can not be accurately collected. To solve this problem, the study designs user online state information management on AAA server used for recording the user online state, then proposes the MSOI charging mechanism based on the design. By the feasibility analysis of MSOI charging mechanism, it indicates that the mechanism can accurately collect the accounting data.