Abstract: It explains the technical characteristics and mechanical principles in the ski jumping sport during the four phases, i.e., approach, takeoff, flight and landing. Relevant experiments have been carried out to investigate the dynamics. It is found that the leg thrust against the ground during takeoff phase and maintaining specific body posture during flight phase are the key factors to ensure the athletes to achieve satisfactory scores during the game. This paper also discusses the possible applications of the relevant experiments for teaching theoretical mechanics.