Web　Services　and　SOA　technologies　are　growing　with　a　fast　rate　but　still　facing　many　problems　due　to　their　heterogeneous　nature.　This　paper,　based　on　OWL-S,　presents　a　rich　and　extensible　ontology　framework　named　OWL-QSP　for　service　compositions.　In　the　framework,　Service　Type　is　imported　to　improve　service　abstract　level,　and　QoS,　Situation,　Context　are　adopted.　Since　service　discovery,　service　selection　and　service　execution　can　adapt　to　the　changing　situation,　QoS　and　Situation-aware　service-based　systems　are　more　dynamic　and　flexible　so　to　better　satisfy　the　users＇　functional　and　non-functional　requirements.　The　introducing　of　Policy　permits　managing　WSs　at　a　high　level　and　facilitate　reuse.　It　also　presents　SMICE,　a　prototype　of　the　service　composition　system,　and　describes　its　main　components　with　service　composition　process.　©　2008　IEEE.