This　paper　begins　with　the　analysis　of　the　domestic　and　foreign　electronic　commerce　credit　related　documents,　and　uses　the　game　method　to　establish　a　single　game　model　of　electronic　commerce,　a　repeated　game　model　of　electronic　commerce　and　a　game　model　of　electronic　commerce　under　the　supervision.　We　then　focus　on　the　decision　making　process　of　the　electronic　commerce　transactions　under　different　models　through　quantitative　analysis　method.　The　research　shows　that　the　key　to　improve　the　credit　level　of　electronic　commerce　is　to　establish　long-term　cooperative　relationship,　enhance　the　regulatory　capacity,　build　an　efficient　information　delivery　mechanism　and　optimize　the　credit　system.