This application discloses an information indication method, a terminal device, and a network device. The method includes: receiving, by a terminal device, indication information from a network device, where the indication information indicates at least one of frequency location information or bandwidth information, the frequency location information includes one of a number of a first subcarrier, an absolute radio frequency channel number of the first subcarrier, or a first frequency, and the bandwidth information includes one of first bandwidth, a second subcarrier quantity, a first resource block quantity, or a second resource block bitmap; and determining, by the terminal device, a first resource based on the indication information, where the first resource is a to-be-reserved resource. According to this application, reliability of a determined location of a resource that needs to be reserved in a system is improved.