An inter prediction method comprising: determining a prediction mode parameter of a current block which indicates using a GPM to determine an inter prediction value of the current block, obtaining a merge motion information candidate list, wherein the merge motion information candidate list comprises one or more motion candidate information item and the motion candidate information item comprises one or two motion vector; generating a GPM motion information candidate list by using the motion vectors included in the motion candidate information items according to a sequence of the motion candidate information items in the merge motion information candidate list comprises a motion vector; selecting, from the GPM motion information candidate list, a first motion vector of a first partition and a second motion vector of a second partition in the current block; and determining the inter prediction value by using the first motion vector and the second motion vector.