A data transmission method applied to a terminal device, the method comprising: obtaining first information indicated by a network device, wherein the first information comprises a high layer parameter for indicating whether simultaneous repetition transmission of a physical downlink shared channel, PDSCH, where PDSCH channels sent by different transmission reception points, TRPs, carry same data, is performed; determining a transmission configuration indicator, TCI, state corresponding to each demodulation reference signal, DMRS, port of the PDSCH according to the first information; and detecting and receiving the PDSCH according to the TCI state corresponding to each DMRS port of the PDSCH; wherein the method further comprises: obtaining TCI information from a downlink control information, DCI, scheduling the PDSCH, the TCI information indicating a plurality of TCI states; wherein the determining the TCI state corresponding to each DMRS port of the PDSCH according to the first information, comprises: if the high layer parameter indicates that the simultaneous repetition transmission of the PDSCH is performed, determining that each DMRS port of the PDSCH corresponds to the plurality of TCI states; and if the high layer parameter indicates that the simultaneous repetition transmission of the PDSCH is not performed, determining that each DMRS port of the PDSCH corresponds to one of the plurality of TCI states. obtaining first information indicated by a network device, wherein the first information comprises a high layer parameter for indicating whether simultaneous repetition transmission of a physical downlink shared channel, PDSCH, where PDSCH channels sent by different transmission reception points, TRPs, carry same data, is performed; determining a transmission configuration indicator, TCI, state corresponding to each demodulation reference signal, DMRS, port of the PDSCH according to the first information; and detecting and receiving the PDSCH according to the TCI state corresponding to each DMRS port of the PDSCH; wherein the method further comprises: obtaining TCI information from a downlink control information, DCI, scheduling the PDSCH, the TCI information indicating a plurality of TCI states; wherein the determining the TCI state corresponding to each DMRS port of the PDSCH according to the first information, comprises: if the high layer parameter indicates that the simultaneous repetition transmission of the PDSCH is performed, determining that each DMRS port of the PDSCH corresponds to the plurality of TCI states; and if the high layer parameter indicates that the simultaneous repetition transmission of the PDSCH is not performed, determining that each DMRS port of the PDSCH corresponds to one of the plurality of TCI states. obtaining TCI information from a downlink control information, DCI, scheduling the PDSCH, the TCI information indicating a plurality of TCI states; wherein the determining the TCI state corresponding to each DMRS port of the PDSCH according to the first information, comprises: if the high layer parameter indicates that the simultaneous repetition transmission of the PDSCH is performed, determining that each DMRS port of the PDSCH corresponds to the plurality of TCI states; and if the high layer parameter indicates that the simultaneous repetition transmission of the PDSCH is not performed, determining that each DMRS port of the PDSCH corresponds to one of the plurality of TCI states. if the high layer parameter indicates that the simultaneous repetition transmission of the PDSCH is performed, determining that each DMRS port of the PDSCH corresponds to the plurality of TCI states; and if the high layer parameter indicates that the simultaneous repetition transmission of the PDSCH is not performed, determining that each DMRS port of the PDSCH corresponds to one of the plurality of TCI states.