Embodiments of this application provide an information transmission method, a terminal device, and a network device. The method includes: receiving, by the terminal device, indication information sent by the network device, where the indication information includes information used to indicate content of M pieces of system information; receiving, by the terminal device, the M pieces of system information sent by the network device; determining, by the terminal device, at least two pieces of system information with same content in the M pieces of system information based on the indication information.