The platform screen door is opened and closed by the transmission of high-speed guide screw pair, and the transmission mechanism is required to have a higher precision and a longer span of life.

With the methods of literature review,video recording observation,statistic and comparison,the author systematically analyzed the advantage and deficiency of female athletes of uneven parallel bars in China.

Making use of literature review,video watching and mathematical statistics,this paper studied systematically the new technical development feature in women s uneven parallel bar in the world.

New development trend of current uneven bars from perspective of World Gymnastics Championshp;

Liang qiong s series of action (reverse hanging-stooping-expanding legs-flipping for one and half rounds-holding bars again) on uneven bars is another innovation in China after Mo s flip and first to provide kinematical parameters and analysis of the movement at different phases.

This paper analyses the structure and development of whole movement of present uneven bars competition, with the study 8 athletes of final competition of uneven bars in Sydney Olympic Games.