Contract　negotiation　and　management　are　very　important　in　supplier　relationship　management.　From　the　point　of　view　of　system　engineering　methodology,　this　paper　analysis　of　the　characteristics　at　all　stages　of　the　business　negotiation　process,　extracts　the　interrelated　relations　from　various　stages　of　business　negotiations,　constructs　an　agent　negotiation　model,　and　establishes　the　negotiation　strategies.　Negotiations　should　take　into　account　the　efficiency　of　the　whole　process　of　business　negotiations,　and　not　just　a　bargaining　stage.　Information　between　the　two　sides　to　negotiate,　such　as　the　environment,　negotiating　goals,　the　relationship,　has　a　serious　impact　on　the　formulation　of　negotiating　strategy,　the　first　proposal　put　forward,　as　well　as　concessions　at　the　bargaining　range.　Full　account　of　these　factors　can　better　improve　the　efficiency　of　the　negotiations.　Finally,　this　paper　shows　the　characteristics　of　the　model　and　strategies　through　the　example.