Method and device for processing received data in mode switching

The invention discloses a method for processing received data in mode switching, which comprises the following steps: restructuring the complete RLC SDU contained in RLC PDU in a receive buffer by an RLC entity, and submitting the restructured RLC SDU as PDCP PDU to a PDCP entity; and processing the received PDCP PDU by the PDCP entity and delivering the PDCP SDU obtained by the processing to an upper layer. The invention further discloses a device for processing received data in mode switch, comprising an RLC entity and a PDCP entity. The method and the device of the invention can reduce frame loss rate in the reception direction.