A method for determining timing advance grouping, comprising: adding, by a base station, a component carrier, CC, for a user equipment, UE; determining (S 102), by the base station and according to obtained timing advance, TA group information or a preset rule, a TA group that the added CC belongs to, wherein the TA group is a set of CCs that can share a TA; and sending, by the base station, identification information that identifies the TA group to the UE, wherein: before the base station adds the CC for the UE, the method further comprising: sending, by the base station, information for querying TAs of CCs to the UE; receiving, by the base station, a query result that is reported by the UE; and performing, by the base station, TA grouping according to the query result, wherein CCs with TAs in a range that is defined by a first threshold and a second threshold are grouped into a TA group; or before the base station adds the CC for the UE, the method further comprising: receiving, by the base station, the TA grouping information that is sent by a network management center, wherein the TA grouping information comprises TA grouping that is performed by the network management center according to a query result that is fed back by the UE, wherein CCs with TAs in a range that is defined by a third threshold and a fourth threshold are grouped into a TA group; or the determining, according to the obtained TA group information, the TA group that the added CC belongs to comprises: receiving, by the base station, a measurement report that is sent by the UE, wherein the measurement report comprises a time offset which is between synchronizations of downlink CCs and is measured by the UE; and determining, by the base station and according to the measurement report, the TA group that the added CC belongs to, wherein in the measurement report, CCs with a synchronization time offset in a range that is defined by a fifth threshold and a sixth threshold are grouped into a TA group. adding, by a base station, a component carrier, CC, for a user equipment, UE; determining (S 102), by the base station and according to obtained timing advance, TA group information or a preset rule, a TA group that the added CC belongs to, wherein the TA group is a set of CCs that can share a TA; and sending, by the base station, identification information that identifies the TA group to the UE, wherein: before the base station adds the CC for the UE, the method further comprising: sending, by the base station, information for querying TAs of CCs to the UE; receiving, by the base station, a query result that is reported by the UE; and performing, by the base station, TA grouping according to the query result, wherein CCs with TAs in a range that is defined by a first threshold and a second threshold are grouped into a TA group; or before the base station adds the CC for the UE, the method further comprising: receiving, by the base station, the TA grouping information that is sent by a network management center, wherein the TA grouping information comprises TA grouping that is performed by the network management center according to a query result that is fed back by the UE, wherein CCs with TAs in a range that is defined by a third threshold and a fourth threshold are grouped into a TA group; or the determining, according to the obtained TA group information, the TA group that the added CC belongs to comprises: receiving, by the base station, a measurement report that is sent by the UE, wherein the measurement report comprises a time offset which is between synchronizations of downlink CCs and is measured by the UE; and determining, by the base station and according to the measurement report, the TA group that the added CC belongs to, wherein in the measurement report, CCs with a synchronization time offset in a range that is defined by a fifth threshold and a sixth threshold are grouped into a TA group. before the base station adds the CC for the UE, the method further comprising: sending, by the base station, information for querying TAs of CCs to the UE; receiving, by the base station, a query result that is reported by the UE; and performing, by the base station, TA grouping according to the query result, wherein CCs with TAs in a range that is defined by a first threshold and a second threshold are grouped into a TA group; or before the base station adds the CC for the UE, the method further comprising: receiving, by the base station, the TA grouping information that is sent by a network management center, wherein the TA grouping information comprises TA grouping that is performed by the network management center according to a query result that is fed back by the UE, wherein CCs with TAs in a range that is defined by a third threshold and a fourth threshold are grouped into a TA group; or the determining, according to the obtained TA group information, the TA group that the added CC belongs to comprises: receiving, by the base station, a measurement report that is sent by the UE, wherein the measurement report comprises a time offset which is between synchronizations of downlink CCs and is measured by the UE; and determining, by the base station and according to the measurement report, the TA group that the added CC belongs to, wherein in the measurement report, CCs with a synchronization time offset in a range that is defined by a fifth threshold and a sixth threshold are grouped into a TA group.