A data packet processing method in an Orthogonal Frequency Division Multiple Access, OFDMA, system, applied to a sending end, comprising: performing code block segmentation on a source data packet to be transmitted to obtain d data blocks; respectively adding a Cyclic Redundancy Check, CRC, sequence to each data block of the d data blocks; respectively performing error correction coding on the d data blocks to each of which the respective CRC sequence has been added; characterized in that the method further comprises: grouping the d data blocks on which the error correction coding has been performed to obtain a information data packets with the same length; performing packet coding on the a information data packets to obtain b check data packets; performing constellation mapping modulation on the a information data packets and the b check data packets to obtain a first modulation symbol sequence with a length of k1 and a second modulation symbol sequence with a length of k2, wherein the first modulation symbol sequence corresponds to the a information data packets and the second modulation symbol sequence corresponds to the b check data packets; mapping the first modulation symbol sequence to M ofdm1 continuous OFDM symbols according to a time order, and mapping the second modulation symbol sequence to M ofdm2 continuous OFDM symbols according to a time order; and sending (308, 309) the M ofdm1 OFDM symbols and the M ofdm2 OFDM symbols, wherein the first OFDM symbol in the M ofdm1 OFDM symbols is sent prior to the first OFDM symbol in the M ofdm2 OFDM symbols; wherein a is an integer greater than or equal to 2, d is an integer greater than or equal to 2, b is an integer greater than or equal to 1, k1 and k2 are both integers greater than or equal to 1, and M ofdm1 and M ofdm2 are both integers greater than or equal to 1. performing code block segmentation on a source data packet to be transmitted to obtain d data blocks; respectively adding a Cyclic Redundancy Check, CRC, sequence to each data block of the d data blocks; respectively performing error correction coding on the d data blocks to each of which the respective CRC sequence has been added; characterized in that the method further comprises: grouping the d data blocks on which the error correction coding has been performed to obtain a information data packets with the same length; performing packet coding on the a information data packets to obtain b check data packets; performing constellation mapping modulation on the a information data packets and the b check data packets to obtain a first modulation symbol sequence with a length of k1 and a second modulation symbol sequence with a length of k2, wherein the first modulation symbol sequence corresponds to the a information data packets and the second modulation symbol sequence corresponds to the b check data packets; mapping the first modulation symbol sequence to M ofdm1 continuous OFDM symbols according to a time order, and mapping the second modulation symbol sequence to M ofdm2 continuous OFDM symbols according to a time order; and sending (308, 309) the M ofdm1 OFDM symbols and the M ofdm2 OFDM symbols, wherein the first OFDM symbol in the M ofdm1 OFDM symbols is sent prior to the first OFDM symbol in the M ofdm2 OFDM symbols; grouping the d data blocks on which the error correction coding has been performed to obtain a information data packets with the same length; performing packet coding on the a information data packets to obtain b check data packets; performing constellation mapping modulation on the a information data packets and the b check data packets to obtain a first modulation symbol sequence with a length of k1 and a second modulation symbol sequence with a length of k2, wherein the first modulation symbol sequence corresponds to the a information data packets and the second modulation symbol sequence corresponds to the b check data packets; mapping the first modulation symbol sequence to M ofdm1 continuous OFDM symbols according to a time order, and mapping the second modulation symbol sequence to M ofdm2 continuous OFDM symbols according to a time order; and sending (308, 309) the M ofdm1 OFDM symbols and the M ofdm2 OFDM symbols, wherein the first OFDM symbol in the M ofdm1 OFDM symbols is sent prior to the first OFDM symbol in the M ofdm2 OFDM symbols; wherein a is an integer greater than or equal to 2, d is an integer greater than or equal to 2, b is an integer greater than or equal to 1, k1 and k2 are both integers greater than or equal to 1, and M ofdm1 and M ofdm2 are both integers greater than or equal to 1.