Abstract: Forty-three tennis players were classified as experts,sub-experts and novices to take part in a video-based experiment.Record the reaction time and event-related potentials in anticipating the direction of opponents' tennis strokes after several stalemate in three different temporal occlusions.The results showed that,experts reacted faster than novice at-80 ms before hitting the ball,and the accuracy was significantly higher than the novices at all-time points.In the early period of the video,a P1 component was evoked in parietal-occipital regions,and the amplitude of P1 was minimal.The experts and sub-experts evoked smaller N1 compared with the novice.The latency of N200 in expert is the longest and the latency of P300 in novice was the longest.In the 800~1 900 ms time window,the mean amplitudes in left hemisphere was larger than the right hemisphere in all participates.In the 500~700 ms,800~1 000 ms,1 400~3 000 ms time window,mean amplitudes of LNC and LPP were significantly different.At-80 ms before the opponent hits the ball,there was a largest N250 evoked by the experts,and the latency of N250 in novices was the longest.In conclusion,experts can make decision fast and accurate by mastering early information.Experts input less cognitive resources during the perception period and more cognitive resources during the period of analogy and analysis the video.Experts were able to make decisions quickly,showed significant advantages in cognitive.