Wireless　Mesh　Networks　(WMNs)　are　a　wireless　broadband　access　technology　based　completely　on　IP　technologies　and　has　thus　rapidly　become　a　means　for　broadband　access　with　the　characteristics　of　high　capacity,　high　speed　and　wide　coverage.　For　trusted　roaming　in　WMNs,　the　configuration　of　the　access　platforms　must　be　checked　first　before　access　to　the　network　can　continue,　and　only　those　platforms　whose　configurations　meet　the　security　requirements　of　the　network　can　be　allowed　to　access　the　network.　It　is　also　required　that　mobile　nodes　complete　access　authentication　not　only　in　a　timely　manner,　but　also　in　a　way　in　which　the　identities　of　the　mobile　nodes　are　well　protected.　In　this　paper,　we　propose　a　trusted　roaming　protocol　that　are　based　on　several　technologies　such　as　hierarchical　network　model,　elliptic　curve　cryptography　(ECC),　trust　evaluation,　grey　relevance　analysis,　etc.　to　ensure　the　security　of　roaming　in　WMNs.　We　also　show　the　security　properties　of　the　proposed　protocol　through　formal　analysis　and　the　performance　by　presenting　some　simulation　results.