Recent　years,　in　the　field　of　supply　chain　coordination,　the　collaborative　planning　mode　based　on　negotiation　is　getting　more　and　more　attention.　For　solving　the　problem　of　order　quantity　between　supplier　and　demander　in　collaborative　supply　chain　under　the　condition　of　stochastic　demand　and　asymmetric　information,　this　paper　established　lot　sizing　order　models:　Retailer＇s　model　and　Manufacturer＇s　model　that　are　used　to　calculate　their　annual　profit　separately.　To　get　a　satisfy　solution　that　both　sides　accept,　a　win-win　algorithm　is　proposed.　This　algorithm　applies　the　equivalents　curve　theory　to　the　negotiation　theory　under　the　condition　of　time　constraints.　It　is　good　to　simulate　the　negotiation　between　sealer　and　buyer　in　practice.　Also,　the　win-win　algorithm　breaks　the　restriction　of　Master-slave　status　in　Stackelberg　mode　and　doesn＇t　need　the　global　information　like　the　centralized　decision-making　mode.　The　algorithm　proposed　in　this　paper　is　shown　more　effective　and　practical　by　the　analysis　of　numerical　example.