A method for generating a protocol data unit, PDU, packet, comprising acquiring (210; 310; 410) a radio link control, RLC, service data unit, SDU, packet; processing (220; 320; 420) the RLC SDU packet according to a preset size of a data packet; and generating a packet header and a data section of a RLC PDU packet according to a processing result, the packet header and the data section constituting the RLC PDU packet; wherein the packet header omits a framing indication, FI, field and a resegmentation flag, RF, field and comprises a preset field, and the preset field comprises a target field that is newly added, a field length of the target field that is newly added being smaller than a total length of the FI field and the RF field, wherein generating packet header of the RLC PDU packet according to the processing result comprises: acquiring a second indication information, wherein when the RLC SDU packet is cascaded, the second indication information indicates whether a first RLC SDU in the data section is an RLC SDU segment; generating the packet header that comprises the target field and omits a segmentation offset, SO, field in a common packet header when the second indication information indicates that the first RLC SDU in the data section is not an RLC SDU segment, the target field comprising the second indication information; and when the RLC SDU packet is not cascaded, the second indication information indicates whether the data section is an RLC SDU segment; generating the packet header that comprises the target field and omits the SO field in the common packet header when the second indication information indicates that the data section is not an RLC SDU segment. processing (220; 320; 420) the RLC SDU packet according to a preset size of a data packet; and generating a packet header and a data section of a RLC PDU packet according to a processing result, the packet header and the data section constituting the RLC PDU packet; wherein the packet header omits a framing indication, FI, field and a resegmentation flag, RF, field and comprises a preset field, and the preset field comprises a target field that is newly added, a field length of the target field that is newly added being smaller than a total length of the FI field and the RF field, wherein generating packet header of the RLC PDU packet according to the processing result comprises: acquiring a second indication information, wherein when the RLC SDU packet is cascaded, the second indication information indicates whether a first RLC SDU in the data section is an RLC SDU segment; generating the packet header that comprises the target field and omits a segmentation offset, SO, field in a common packet header when the second indication information indicates that the first RLC SDU in the data section is not an RLC SDU segment, the target field comprising the second indication information; and when the RLC SDU packet is not cascaded, the second indication information indicates whether the data section is an RLC SDU segment; generating the packet header that comprises the target field and omits the SO field in the common packet header when the second indication information indicates that the data section is not an RLC SDU segment. acquiring a second indication information, wherein when the RLC SDU packet is cascaded, the second indication information indicates whether a first RLC SDU in the data section is an RLC SDU segment; generating the packet header that comprises the target field and omits a segmentation offset, SO, field in a common packet header when the second indication information indicates that the first RLC SDU in the data section is not an RLC SDU segment, the target field comprising the second indication information; and when the RLC SDU packet is not cascaded, the second indication information indicates whether the data section is an RLC SDU segment; generating the packet header that comprises the target field and omits the SO field in the common packet header when the second indication information indicates that the data section is not an RLC SDU segment.