In　order　to　solve　the　increasing　problems　of　information　isolated　island　and　enterprise　integration　in　integrated　information　service　systems　of　modern　enterprise,　the　authors　introduce　how　to　build　information　service　system　with　Service-Oriented　Architecture　(SOA)　and　how　to　integrate　J2EE　platform　and　Domino　system　with　Web　service　technology.　J2EE　platform　and　Domino　system　are　two　primary　information　service　systems　solutions.　In　our　architecture,　the　two　systems　are　selected　to　implement　different　sub-system　components　according　their　own　advantages.　Web　Service　is　exploited　to　integrate　those　components　to　a　uniform　service　platform.　Based　on　such　a　platform,　various　applications　are　designed　with　Web　Service　composition.　In　this　way,　sub-systems　are　well　connected　and　diversified　information　and　resources　can　be　easily　and　effectively　shared.　This　method　provides　a　good　reference　for　building　enterprise　information　service　system　and　integrating　various　systems　and　information.