Abstract: The invention relates to an access method in a 5G system. For user equipments: based on a virtual SIM technology and ID sharing, the user equipments can modify their ID dynamically and the user equipments sharing the same ID can access a network based on a non-orthogonal multiple access technology. For the network: a signaling load of the access network can be reduced due to grant-free and non-orthogonal technologies, meanwhile, the user equipments with the same ID will be allocated with the same radio bearer, when mass equipments are accessed at the same time, it can effectively reduce a signaling overload of the access network and a core network, improve a resource utilization efficiency of the network equipment, and ensure a normal access of users for data transmission.