In　the　environment　of　E-Commerce,　participants　in　negotiations　lack　fair　and　reasonable　mechanism　which　restricts　the　application　of　automated　negotiation.　This　is　becoming　a　bottleneck　of　negotiation＇s　development.　This　article　explores　multi-Agent　automated　negotiation　framework　based　on　third　party,　researches　the　functions　which　all　participants　in　negotiation　should　have,　and　then　presents　an　automated　negotiation　model　based　on　third　party.　It　also　describes　the　process　of　negotiation　proposal　and　finally　develops　a　prototype　system　which　verifies　the　feasibility　and　efficiency　of　multi-Agent　automated　negotiation　model　based　on　third　party.