Fecha de publicación: 11/06/2021 Fuente: Wipo "IOT" The embodiment of the invention provides a test method, a communication system and NB-IoT devices, the test method is applied to a plurality of NB-IoT devices, the plurality of NB-IoT devices are connected with SDR equipment, and the test method comprises the following steps: accessing each NB-IoT device to at least one of a plurality of NB-IoT service cells simulating a current network, and running the test case loaded on the NB-IoT device to interact with a simulation application server so as to test the NB-IoT device, wherein the NB-IoT service cell simulating the current network is a service cell formed by loading network configuration parameters to the SDR equipment. According to the embodiment of the invention, automatic testing of the NB-IoT device is effectively realized.