A spectrum sharing method includes a first base station (BS) establishes a first sharing cell of a first-standard network at a shared frequency, establishes a service of a user equipment (UE) of the first-standard network in the first sharing cell, and transmits data on a Traffic Radio Bearer (TRB) of the first UE. A second BS establishes a second sharing cell at the shared frequency, and establishes a service of a second UE of the second-standard network in the second sharing cell. When the shared frequency is shared, the first BS suspends the data transmission on the TRB of the service of the first UE, and retains a common channel of the first sharing cell and a SRB of the service of the UE of the first-standard network. The second BS then starts data transmission on the TRB of the service of the second UE.