When I started producing 3d animation, Avatar 2 was being released. While I was excited and amazed by the maturity of motion capture technology, I also had a question: Can this technology be applied to the production of animated films? Can live-action replace animated character acting? I did not get the answer until this paper, I started from whether motion capture technology can replace the work of 3d animators, and finally find the key in the research on the difference between live action and animated performance.