Web　Services　is　the　focus　of　IT　fields　at　present.　The　purpose　of　Web　services　is　to　provide　a　common　technology　layer　that　has　no　relation　with　language　and　platform.　The　application　of　different　platforms,　special　in　E-business　system　needs　this　technology　layer　to　connect　and　integrate　dynamically　with　each　other.　Firstly,　this　paper　introduces　simple　the　concept　and　architecture　of　Web　Services　and　analyzes　the　core　technologies　to　construct　Web　services,　XML,　SOAP,　WSDL　and　UDDI　in　detail.　Secondly　based　on　Web　services　and　BPEL4WS　technology,　an　open　and　distributed　dynamic　E-business　system　structure　is　brought　out　and　realized.　Finally,　the　front　design　done　on　dynamic　E-business　system　is　summarized　and　further　work　is　prospected.