The　Internet　of　Things　(IoT)　is　a　heterogeneous　network　composed　of　different　types　of　wireless　networks,　such　as　wireless　sensor　networks　(WSNs),　ZigBee,　Wi-Fi,　AD　Hoc,　and　RFID.　However,　the　openness　of　the　IoT　environment,　the　diversity　of　services,　and　the　limited　energy　of　terminals　make　the　security　of　IoT　a　serious　challenge.　Hence,　we　propose　a　distributed　IoT　trusted　operation　scheme　based　on　dynamic　trusted　metric.　The　scheme　combines　the　direct　communication　and　the　indirect　recommended　trustworthiness　metric　to　calculate　the　final　trustworthiness　metric　value　of　nodes.　The　recommendation　trustworthiness　confidence　and　recommendation　deviation　factors　are　introduced　to　reduce　the　risk　of　malicious　recommendation,　so　that　the　trustworthiness　metric　results　can　reflect　the　trustworthiness　status　of　nodes　more　realistically.　On　this　basis,　a　trusted　operation　mechanism　for　terminal　devices　is　proposed.　Based　on　trustworthiness　metric,　this　mechanism　ensures　the　safe　joining　of　trusted　individuals,　realizes　the　selection　of　terminal　data　transmission　relay　nodes,　and　maintains　the　secure　and　reliable　operation　of　network　environment.　Simulation　results　show　that　our　scheme　can　truly　and　effectively　reflect　the　trustworthy　state　of　nodes　and　outperforms　similar　trustworthy　metric　models　in　terms　of　energy　consumption.　©　2023　IEEE.