The embodiments of the present application provide a wireless communication method, a terminal device and a network device, when there are not enough CSI processing units in the idle state, the terminal device can select a part of CSIs from a plurality of aperiodic CSIs that are triggered by the network device to be fed back and feed back, and the manner of CSI feedback is more flexible. The method includes: receiving, by a terminal device, first information and second information transmitted by a network device, where the first information is configured to trigger the terminal device to feed back aperiodic N CSIs, and to indicate a PUSCH resource to be used when the CSIs are fed back, and the second information is configured to indicate channel measurement and interference measurement resources corresponding to the N CSIs, N being an integer greater than or equal to 2; determining, by the terminal device, M CSIs that need to be fed back from the N CSIs according to the first information, the second information and M CSI processing units currently in an idle state, M being an integer greater than 0 and less than N; calculating, by the terminal device, payloads of the M CSIs that need to be fed back, respectively, and feeding back the M CSIs that need to be fed back on the PUSCH resource.