This application provides a method for determining time domain resources used for unauthorized transmission. The method, the terminal device, obtaining a first time domain period and a second time domain period of the unlicensed transmission resource-wherein the first time domain period is P 1 hour unit, the second time domain period is P 2 In hours, P 1 is greater than or equal to P 2 -; Obtaining, by the terminal device, a quantity k of unlicensed transmission resources within the first time domain period; And a first time domain period, a second time domain period, and a time unit in which the terminal device locates an unlicensed transmission resource used for unlicensed transmission based on the quantity k of unlicensed transmission resources in the first time domain period. And determining an index. In this way, unlicensed transmission resources configured for the terminal device do not overlap within two adjacent periods.
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