Today＇s　dynamic　trust　model　only　research　one　to　one　trust　relation　and　there　are　no　researches　about　one　to　many,　many　to　one,　many　to　many　trust　relation.　Based　on　subjective　logic,　four　basic　group　constraint　patterns　and　their　nesting　to　compose　a　group　were　proposed　at　the　point　of　view　of　trust＇s　subjectivity　and　supports　group　trust　relation.　A　group　dynamic　trust　model　based　on　these　four　basic　constraint　patterns　was　proposed,　and　direct　trust　degree　and　recommendation　trust　degree　formulae　of　basic　constraint　patterns　and　their　nesting　were　brought　up.　The　model　has　good　applicability　and　practicability　through　model＇s　expressive　power　analysis　and　model＇s　validity　analysis.