Recently, Internet of Things (IOT) multigroup users access Internet more and more frequently,which leads status information of route nodes to vary incessantly in real time and generates ineffective QoS routing under inaccurate status information of route nodes.A routing model for IOT multigroup accessing Internet resource IOTGR was proposed.The model attempts to solve the problem on the aspect of the heuristic algorithm combining precomputation with ondemandcomputation.Experimental results show that the model effectively reduces the impact of inaccurate network status information on QoS routing by means of the heuristic algorithm and provides effective realtime QoS services to multigroup accessing internet resource in inaccurate information environment.