Objective This article is to study the drop jerk in the characteristics of kinematics and dynamics, and offer the theoretical basis to athletes and coaches to think and look for the clean & jerk mode that suits themselves. Methods The study selects the testing method that three-dimensional video synchronizes camera with force platform. Results The results indicate the height of drop under the barbell to drop jerk is lower, the velocity of drop jerk under the barbell of gravity center of body is higher, the rising distance of barbell is short, the rising velocity which barbell needs is less; its stabilization angle and balance angle of drop jerk are much less, its stability is very bad and it is easy to lead being lost, the duration of the drop under the barbell and uprising of the drop jerk is longer. The distance of uprising is also longer, so the body will consume more energy. Conclusion The jerk force of drop jerk is smaller than the others, but its stability is very bad in drop under the barbell and uprise phases.