The characteristics of eye-movement of primary and secondary professional tennis players and general tennis fans are recorded and compared by Eyelink II eye-tracker when they watched the pictures of tennis pitching. The results shows that with the higher levels of sports, the adolescent tennis athlete's decision-making speed becomes more quicker and the accuracy more higher, along with the growth of age, the adolescent tennis athletes’ pattern of eye movement is more effectively, exhibiting to the improvement of the eye movement index, such as fixation time、fixation duration and saccade amplitude, and can be more effectively and faster to gaze at the tennis information. Adolescent tennis players’ decision-making capacity with age differences is the three different integration of “information acquisition, information processing and to take action”