By methods of literature review,3D video,mathematics statistic,the paper does a research on Chineses outstanding male javelin athletes throwing arm movement after cross-stride from right foot landing to javelin off.

His technical characteristics have been summarized as follows: opproach distance is longer,approach velocity is faster and the loss of velocity before and after the second cross step negatively correlates with throwing result;the range of increment in the velocity of center of .

The contribution of cross modality to fatigue damage accumulation of structure subjected to random vibration;