This application provides an information transmission method, an apparatus, and a device, which are applicable to the communication field, and are used to feed back information obtained based on channel information of different network devices, so as to improve performance gains and reduce performance loss. The method includes: The terminal device obtains at least one piece of channel information including large-scale information and small-scale information; performs normalization processing on the channel information to obtain at least one piece of first information and at least one piece of second information, where the first information is small-scale information obtained through normalization processing, and the second information is large-scale information obtained through normalization processing; and then sends channel state information including R pieces of first information obtained through quantization processing or including R pieces of first information obtained through quantization processing and R pieces of second information obtained through quantization processing.