Abstract: To solve the problem that traditional network cannot satisfy the development of future network, network slice (NS) technology was introduced. A conception of software defined trust (SDT) based on software defined network (SDN) and trusted computing was proposed in this paper. In view of OpenvSwitch (OVS) and virtual tenant network (VTN) of OpenDaylight, a model of NS based SDT was put forward. When a tenant requests the resource, it can gather the trust state of switches and distribute the trusted NS for different demands accordingly. When the NS is untrusted in using, it can make rectifications by OVS retroversion and flow table recovery. After experimental verification, this method improves the resource utilization and the efficiency of NS recovery while guaranteeing its trust state.