A channel state information, CSI, reporting method executed by a terminal device, or by a chip in the terminal device, the method comprising: receiving, from a network device, downlink control information, DCI, on a physical downlink control channel, PDCCH, wherein the DCI comprises first indication information, and the first indication information is configured to trigger the terminal device to report CSI on a first uplink channel; determining, based on the DCI and/or higher layer signaling, a first time interval from a plurality of candidate first time intervals corresponding to a first subcarrier spacing; wherein the first subcarrier spacing is one of the following plurality of subcarrier spacings: a 15 kilohertz, kHz, subcarrier spacing, a 30 kHz subcarrier spacing, a 60 kHz subcarrier spacing, and a 120 kHz subcarrier spacing, using the first time interval to determine whether the first indication information is valid; wherein the first indication information is valid when a time interval between the last symbol of the PDCCH and the first symbol of the first uplink channel is greater than or equal to the first time interval;and sending the CSI triggered by the first indication information to the network device on the first uplink channel when the first indication information is valid; characterized in that a correspondence between the first subcarrier spacing and the first time interval meets at least one of the following conditions: a first time interval corresponding to a 15 kHz subcarrier spacing is less than or equal to eight symbols, a first time interval corresponding to a 30 kHz subcarrier spacing is less than or equal to 12 symbols, a first time interval corresponding to a 60 kHz subcarrier spacing is less than or equal to 24 symbols, and a first time interval corresponding to a 120 kHz subcarrier spacing is less than or equal to 42 symbols. receiving, from a network device, downlink control information, DCI, on a physical downlink control channel, PDCCH, wherein the DCI comprises first indication information, and the first indication information is configured to trigger the terminal device to report CSI on a first uplink channel; determining, based on the DCI and/or higher layer signaling, a first time interval from a plurality of candidate first time intervals corresponding to a first subcarrier spacing; wherein the first subcarrier spacing is one of the following plurality of subcarrier spacings: a 15 kilohertz, kHz, subcarrier spacing, a 30 kHz subcarrier spacing, a 60 kHz subcarrier spacing, and a 120 kHz subcarrier spacing, using the first time interval to determine whether the first indication information is valid; wherein the first indication information is valid when a time interval between the last symbol of the PDCCH and the first symbol of the first uplink channel is greater than or equal to the first time interval;and sending the CSI triggered by the first indication information to the network device on the first uplink channel when the first indication information is valid; characterized in that a correspondence between the first subcarrier spacing and the first time interval meets at least one of the following conditions: a first time interval corresponding to a 15 kHz subcarrier spacing is less than or equal to eight symbols, a first time interval corresponding to a 30 kHz subcarrier spacing is less than or equal to 12 symbols, a first time interval corresponding to a 60 kHz subcarrier spacing is less than or equal to 24 symbols, and a first time interval corresponding to a 120 kHz subcarrier spacing is less than or equal to 42 symbols.