The supply of dietary nutrition is an important guarantee for athletes to deliver a good performance in training and games and a foundation to maintain a good economic status and it plays a vital promoting role in eliminating post-training and post-game fatigue. Currently constant improvements are witnessed in skills and achievements of middle and long distance running and one of the measures is the employment of science in athlete training. Then a question arises whether a rational dietary intervention will greatly influence athletes' game performance. This study will elaborate on this question. The study, by means of literature analysis, questionnaire and other methods, takes the middle-and-long-distance runners at 15 to 18 years old from some vocational college as study subject, namely, 40 randomly selected from the total number of such 70 runners for studying the correlation between dietary intervention and game performance. Through empirical analysis, it shows that scientific and rational proportion of dietary nutrition plays a decisive role in middle-and-long distance runners' training and game performance, because dietary intervention can make such runners' body composition change, increase their anaerobic threshold power and maintain a high hemoglobin concentration in vivo.
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