The invention provides a method and a device for determining an anti-jamming capability of UE in a multi-user superposition transmission (MUST) system. The MUST system comprises a base station, first UE and second UE, wherein the base station pairs the first UE with the second UE for performing MUST transmission, the first UE is near-end UE of the base station, and the second UE is remote UE of the base station. The method comprises the steps of at the base station, configuring a first reference signal (RS) sequence that is used for determining channel quality information between the first UE and the base station; transmitting the first RS sequence and a second RS sequence to the first UE in a multiplexing manner in a resource block applied to the second RS sequence, wherein the first RS sequence is set to be the second RS sequence with first power applied to the first UE and the second RS sequence with second power applied to the second UE, or superposition of the second RS sequence with the first power and the second RS sequence with the second power, and the first power is less than the second power.