A wireless communication method and device are provided. The wireless communication method includes the steps of determining, by a user equipment (UE), that a length of an radio link control (RLC) service data unit (SDU) or RLC SDU segment is greater than a threshold, determining, by the UE, a type of length indicator which is allocated by a network, and determining, by the UE, to force to map the RLC SDU or RLC SDU segment to the end of an RLC protocol data unit (PDU) if the type of the length indicator is a first type.