Embodiments of the present invention provide an information transmission method, and the method includes: generating, by a terminal device, first information; determining, by the terminal device, a first sequence from N sequence candidates based on the first information, where the first information belongs to N information candidates, a mapping between the first information and the first sequence belongs to P mappings, each of the P mappings includes a mapping between the N information candidates and the N sequence candidates, and the N sequence candidates are generated based on N dedicated cyclic shift values and a first initial cyclic shift value; and in at least two mappings, dedicated cyclic shift values used to generate sequence candidates corresponding to a same information candidate are different, where the same information candidate belongs to L information candidates in the N information candidates, both P and L are integers greater than 1, and the L is less than or equal to N; and sending, by the terminal device, the first sequence. Therefore, this helps improve information transmission performance.