A network configuration method and apparatus and a system, the network configuration method includes: receiving, by a target primary eNB of user equipment, a handover request message transmitted by a source primary eNB of the user equipment, the handover request message containing identification indication information or service indication information of the user equipment in a serving eNB before handover; and transmitting, by the target primary eNB of the user equipment, the identification indication information or the service indication information to a target secondary eNB of the user equipment, so that the target secondary eNB performs resource configuration for services of the user equipment according to the identification indication information or the service indication information. With the method, apparatus and system of the embodiments of the present disclosure, waste of resources resulted from repeated reservation of the resources may be avoided.