A wireless communication method and device are provided. The wireless communication method includes the steps of determining whether the length of an RLC SDU or RLC SDU segment is greater than a threshold; determining the type of length indicator which is allocated by a network when the length of the RLC SDU or RLC SDU segment is greater than the threshold; and determining whether to force to map the RLC SDU or RLC SDU segment to the end of an RLC PDU according to the type of the length indicator.