This application relates to the field of video encoding and decoding technologies, and provides a video decoding method, a video encoding method, a decoder, an encoder, an electronic device, and a computer-readable storage medium. The decoding method includes: parsing a code stream to determine a target block, in accordance with a determination that a prediction mode of the target block is intra block copy (IBC) prediction; determining target prediction information of the target block based on reconstruction information of an adjacent region of the target block and original prediction information of the target block; and determining reconstruction information of the target block based on the target prediction information. According to the solution of this application, reconstruction information of a surrounding region of the target block is added to the target prediction information, which facilitates smooth transition between the target block and the surrounding region thereof.