Abstract: In recent years,with the rapid development of computer graphics,especially the research and application of computer animation,a large number of robot body,exoskeleton and other digital bodies have appeared in science fiction films.This refers to the body phenomenon,gradually formed a set of unique visual symbols.Combining the intersection of artificial intelligence and digital algorithm,how to change from the natural body based on real actors to the digital body,and maintain the naturalness of its behaviors and emotions on this basis,thus forming the natural integration and interaction of behaviors and emotions of the digital body,has become another challenge for the research and application of computer graphics.The article from the perspective of cognitive science,with digital characters of science fiction movies,for example,the"body schema"as understanding the behavior of digital body and the key to emotional nature fusion,and theoretically analyze from the inner perception to the space transformation and interaction,which including digital body,compound and artificial body.Related research has a positive effect on how to design more humanized virtual human in science fiction movies in the future.