Face changing technology-based reasoning optimization method and system

The invention relates to a reasoning optimization method and system based on a face changing technology, which is applied to the technical field of video face changing, and comprises the following steps: preprocessing a source video file to obtain a first picture file and a second picture file; face recognition is carried out on the first picture file and a preset target file, face information is obtained, and the face information comprises source face features, a source face area and target face features; performing face changing on the first picture file based on the face information and a preset face changing engine to obtain a first target picture; speculating face key points based on a preset texture code recognizer, a motion estimation encoder and the face information to obtain face key point information; performing face replacement on the second picture file according to the face key point information and the face replacement engine to obtain a second target picture; and synthesizing the first target p