The present invention provides a method for supporting transmission of a group service, which includes: a MCE sends a pending notification message to a MME, wherein the pending notification message includes an identity (TMGI) of a GCSE service; and the MME sends the pending notification message to a GCSE server or a BM-SC. The present disclosure also provides a system for supporting transmission of the group service, a method for establishing a GCSE data bearer and a base station. By adopting the present disclosure, the risk of data loss due to a change of the data bearer is reduced, time delay of establishing the data bearer is reduced, air interface resource is effectively utilized, and power consumption of A UE is saved.