A decoding method includes the following. A bitstream is parsed to determine first picture-level syntax identification information corresponding to a base mesh of a current picture. When the first picture-level syntax identification information indicates inter decoding, dimension syntax identification information corresponding to each of multiple coordinate dimensions for a vertex in the base mesh is determined by parsing the bitstream, where the dimension syntax identification information corresponding to each coordinate dimension indicates a motion-vector prediction mode corresponding to the coordinate dimension. Based on the dimension syntax identification information corresponding to each of the multiple coordinate dimensions, a motion-vector decoded value corresponding to each coordinate dimension for the vertex is determined, thereby determining motion-vector decoded information corresponding to the vertex.