Abstract: With the  experimental instrument——Motion Analysis System,this article presents a contrastive analysis of forward  and backward whip-kicking,pointing out the advantages and disadvantages of the two technics,in order that  some theoretical evidence will be provided for technical training concerned,and the scientific training of whip-kicking technics be enhanced.

Key words: free combat, forward whip-kicking, backward whip-kicking, linear velocity, angular velocity