Disclosed is a data transmission method, data reception method and apparatus. The data transmission method comprises steps of: determining whether a plurality of PDCP PDUs are consecutive; mapping the plurality of PDCP PDUs to one RLC PDU when the plurality of PDCP PDUs are consecutive, wherein a PDCP SN of a first PDCP PDU among the plurality of PDCP PDUs is reserved, while PDCP SNs of the remaining PDCP PDUs are removed; and setting a flag bit in a RLC PDU's header as a first preset value to indicate that the plurality of PDCP PDUs are consecutive. With the methods and apparatus according to the present invention, radio resource in the mobile wireless communication systems can be saved since transmission of redundant information may be reduced.