Due　to　quick　changes　of　business　needs　for　enterprises　and　lack　of　flexibility　of　traditional　static　collaboration,　a　framework　for　dynamic　SOA(service-oriented　architecture)-based　collaboration　is　proposed.　It　has　three　layers,　including　collaborative　service　layer,　cooperative　control　layer,　and　collaborative　execution　layer.　The　operating　mechanism　of　this　architecture,　such　as　the　contents　of　each　layer　and　the　interaction　between　them,　is　described.　In　order　to　make　the　coordinative　service　be　efficient　and　flexible,　based　on　the　architecture,　a　policy　is　used　to　express　the　various　constraints　of　service　and　manage　the　coordination　between　services.　Then　a　dynamic　generation　algorithm　for　dynamic　service　collaboration　is　proposed　and　details　of　the　algorithm　are　given.　Finally,　a　forgery-proof　enterprise＇s　logistics　system　is　taken　as　an　example　for　dynamic　coordination,　and　demonstrates　the　feasibility　and　superiority　of　the　dynamic　SOA-based　collaborative　technique.