Currently,　security　is　a　critical　factor　for　multimedia　services　running　in　the　cloud　computing　environment.　As　an　effective　mechanism,　trust　can　improve　security　level　and　mitigate　attacks　within　cloud　computing　environments.　Unfortunately,　existing　scheduling　strategy　for　multimedia　service　in　the　cloud　computing　environment　do　not　integrate　trust　mechanism　when　making　scheduling　decisions.　In　this　paper,　we　propose　a　scheduling　scheme　for　multimedia　services　in　multi　clouds.　At　first,　a　novel　scheduling　architecture　is　presented.　Then,　We　build　a　trust　model　including　both　subjective　trust　and　objective　trust　to　evaluate　the　trust　degree　of　multimedia　service　providers.　By　employing　Bayesian　theory,　the　subjective　trust　degree　between　multimedia　service　providers　and　users　is　obtained.　According　to　the　attributes　of　QoS,　the　objective　trust　degree　of　multimedia　service　providers　is　calculated.　Finally,　a　scheduling　algorithm　integrating　trust　of　entities　is　proposed　by　considering　the　deadline,　cost　and　trust　requirements　of　multimedia　services.　The　scheduling　algorithm　heuristically　hunts　for　reasonable　resource　allocations　and　satisfies　the　requirement　of　trust　and　meets　deadlines　for　the　multimedia　services.　Detailed　simulated　experiments　demonstrate　the　effectiveness　and　feasibility　of　the　proposed　trust　scheduling　scheme.