A random access method in Long Term Evolution-Advanced, LTE-A, using a carrier aggregation technology, comprising: receiving by a target evolved Node B, eNB, a handover request message sent by a source eNB, wherein the handover request message comprises a User Equipment, UE's capability information about at least one target component carrier being supported and information of a target component carrier selected by the source eNB, and the target component carrier selected is a carrier to use when the UE executes random access to the target eNB determining by the target eNB whether to allow the at least one target component carrier selected by the source eNB; if the at least one target component carrier selected by the source eNB is allowed by the target eNB, sending by the target eNB a handover request acknowledgement message to the source eNB, wherein the handover request acknowledgement message comprises information about the target component carrier selected by the source eNB; if the at least one target component carrier selected by the source eNB is not allowed by the target eNB, configuring by the target eNB at least one target component carrier to use when the UE executes the random access and sending by the target eNB the handover request acknowledgement message to the source eNB, wherein the handover request acknowledgement message comprises information about the at least one target component carrier configured; sending, by the source eNB, the at least one target component carrier configured by the target eNB or selected by the source eNB to the UE through a handover command; and after receiving by the target eNB a dedicated random access preamble sent by the UE, sending by the target eNB a random access response message on at least one component carrier in the at least one target component carrier. receiving by a target evolved Node B, eNB, a handover request message sent by a source eNB, wherein the handover request message comprises a User Equipment, UE's capability information about at least one target component carrier being supported and information of a target component carrier selected by the source eNB, and the target component carrier selected is a carrier to use when the UE executes random access to the target eNB determining by the target eNB whether to allow the at least one target component carrier selected by the source eNB; if the at least one target component carrier selected by the source eNB is allowed by the target eNB, sending by the target eNB a handover request acknowledgement message to the source eNB, wherein the handover request acknowledgement message comprises information about the target component carrier selected by the source eNB; if the at least one target component carrier selected by the source eNB is not allowed by the target eNB, configuring by the target eNB at least one target component carrier to use when the UE executes the random access and sending by the target eNB the handover request acknowledgement message to the source eNB, wherein the handover request acknowledgement message comprises information about the at least one target component carrier configured; sending, by the source eNB, the at least one target component carrier configured by the target eNB or selected by the source eNB to the UE through a handover command; and after receiving by the target eNB a dedicated random access preamble sent by the UE, sending by the target eNB a random access response message on at least one component carrier in the at least one target component carrier.