A subframe offset-based carrier aggregation method, comprising: determining, by a base station, to add a secondary component carrier; determining, by the base station, to offset a subframe of the secondary component carrier, said method being characterized by: determining, by the base station, a subframe offset amount of the secondary component carrier relative to a primary component carrier according to a subframe ratio of the primary component carrier and a subframe ratio of the secondary component carrier, wherein the subframe offset amount is a magnitude of N subframes, the subframe offset amount is not equal to an integer multiple of a period of the subframe ratio of the secondary component carrier, and N is a positive integer greater than or equal to 1; and configuring, by the base station, the secondary component carrier for each user equipment, UE, in a first user equipment UE set within a coverage area of the base station, and sending configuration information to each UE in the first UE set, wherein the configuration information comprises: a frequency of the secondary component carrier, the subframe ratio of the secondary component carrier, and the subframe offset amount of the secondary component carrier. determining, by a base station, to add a secondary component carrier; determining, by the base station, to offset a subframe of the secondary component carrier, said method being characterized by: determining, by the base station, a subframe offset amount of the secondary component carrier relative to a primary component carrier according to a subframe ratio of the primary component carrier and a subframe ratio of the secondary component carrier, wherein the subframe offset amount is a magnitude of N subframes, the subframe offset amount is not equal to an integer multiple of a period of the subframe ratio of the secondary component carrier, and N is a positive integer greater than or equal to 1; and configuring, by the base station, the secondary component carrier for each user equipment, UE, in a first user equipment UE set within a coverage area of the base station, and sending configuration information to each UE in the first UE set, wherein the configuration information comprises: a frequency of the secondary component carrier, the subframe ratio of the secondary component carrier, and the subframe offset amount of the secondary component carrier. determining, by the base station, a subframe offset amount of the secondary component carrier relative to a primary component carrier according to a subframe ratio of the primary component carrier and a subframe ratio of the secondary component carrier, wherein the subframe offset amount is a magnitude of N subframes, the subframe offset amount is not equal to an integer multiple of a period of the subframe ratio of the secondary component carrier, and N is a positive integer greater than or equal to 1; and configuring, by the base station, the secondary component carrier for each user equipment, UE, in a first user equipment UE set within a coverage area of the base station, and sending configuration information to each UE in the first UE set, wherein the configuration information comprises: a frequency of the secondary component carrier, the subframe ratio of the secondary component carrier, and the subframe offset amount of the secondary component carrier.