A wireless communication method is provided. The method includes: determining, by a terminal device, a first coefficient, where the first coefficient belongs to a first coefficient set corresponding to a first transmission time interval TTI, the first coefficient set includes N coefficients, N≥2, and the N coefficients include at least two coefficients used for uplink transmission in the first TTI, or at least two coefficients used for downlink transmission in the first TTI; determining, by the terminal device, a first transport block size TBS based on the first coefficient; and performing, by the terminal device, wireless communication based on the first TBS in the first TTI. Reliability and accuracy of wireless communication can be improved.