Purpose: Thhe aim of this study is to understand the effects of knowledge performance and video feedback on the forehand grip of flat serve motor skill learning on table tennis. Methods: 30 junior high school students were randomly assigned to the control group, the KP group and KP + Video group, to carry out forehand grip of flat serve motor skill learning for 5 days, and the forehand grip of flat serve test was taken by the three groups before and after motor skill learning. The one-way ANOVA was used to compare the feedback effect on different groups, and the paired samplet-test was used to analyze the pre- and post-motor skill learning. Results: (1) The feedback which was offered to students could improve on the forehand grip of flat serve motor skill on table tennis. (2) The KP + Video group performed batter than the KP group on the forehand grip of flat serve motor skill learning on table tennis.