In the process of expressing ideas and conveying information, a picture is worth a thousand words. Likewise, the effect of a short video is better than that of a pile of pictures + text. Occasionally, we can see some creative short animation videos with hand-drawn style on the Internet, for example: one hand holding a paintbrush automatically draws picture after picture, just like a fast-forward sand painting. This kind of hand-drawn video is not only creative, but also very attractive to the audience.