This　paper　presents　an　inter-enterprise　application　integration　model　based　on　XML,　web　service　and　workflow　technology.　In　the　model　XML　is　used　as　the　unified　standard　of　data　exchange　to　realize　heterogeneous　information　exchange　between　different　enterprises;　Depending　on　Web　service　and　its　correlative　protocols,　a　loose　integrated　relationship　of　applications　is　formed;　And　using　workflow　technology　based　on　service,　Web　services　can　be　dynamically　combined　and　integrated　so　that　realizes　business　collaboration　among　different　enterprises.