A method for processing a measurement event in a multi-carrier system, the method comprising the steps that: a mobile terminal (204; 804) receives a measurement assignment which is configured and transmitted by a network side device (202; 802); the mobile terminal determines a neighbour cell and a serving cell corresponding to the received measurement assignment, and the mobile terminal measures the determined neighbour cell and serving cell; and when a measurement result meets a report condition of a measurement event corresponding to the received measurement assignment, the mobile terminal reports the measurement result, wherein the step of the mobile terminal determining a neighbour and a serving cell corresponding to the received measurement assignment comprises: when a measurement event corresponding to the measurement assignment is a first measurement event, the serving cell corresponding to the measurement assignment is a primary serving cell, wherein the first measurement event can only be identified by an advanced long-term evolution, LTE-A, device; and when a measurement event corresponding to the measurement assignment is a second measurement event and the mobile terminal works in the multi-carrier aggregation state, the serving cell corresponding to the measurement assignment is a secondary serving cell, wherein the second measurement event can be identified by a long-term evolution, LTE, device and an LTE-A device. a mobile terminal (204; 804) receives a measurement assignment which is configured and transmitted by a network side device (202; 802); the mobile terminal determines a neighbour cell and a serving cell corresponding to the received measurement assignment, and the mobile terminal measures the determined neighbour cell and serving cell; and when a measurement result meets a report condition of a measurement event corresponding to the received measurement assignment, the mobile terminal reports the measurement result, wherein the step of the mobile terminal determining a neighbour and a serving cell corresponding to the received measurement assignment comprises: when a measurement event corresponding to the measurement assignment is a first measurement event, the serving cell corresponding to the measurement assignment is a primary serving cell, wherein the first measurement event can only be identified by an advanced long-term evolution, LTE-A, device; and when a measurement event corresponding to the measurement assignment is a second measurement event and the mobile terminal works in the multi-carrier aggregation state, the serving cell corresponding to the measurement assignment is a secondary serving cell, wherein the second measurement event can be identified by a long-term evolution, LTE, device and an LTE-A device. when a measurement event corresponding to the measurement assignment is a first measurement event, the serving cell corresponding to the measurement assignment is a primary serving cell, wherein the first measurement event can only be identified by an advanced long-term evolution, LTE-A, device; and when a measurement event corresponding to the measurement assignment is a second measurement event and the mobile terminal works in the multi-carrier aggregation state, the serving cell corresponding to the measurement assignment is a secondary serving cell, wherein the second measurement event can be identified by a long-term evolution, LTE, device and an LTE-A device.