In order to improve the effect of oscillating arms and performance in triple jump, divides 16 athletes into two groups---the group of experimentation adopting the method of oscillating single arm and the group of comparison adopting the method of oscillating double arms in the triple-jump training. After 18 weeks training, the result indicates that the group of experimentation has better performance than that of the group of comparison. Makes an analysis from the aspects of biomechanics, the habit of running and effect of exerting velocity. Draws a conclution that the effect of oscillating single arm is better than that of oscillating double arms and oscillating single arm method is more representative of current trends in triple jump.