The aim of this study is to investigate the effects of brisk-walking on the attention problems of junior high school students with attention deficit/ hyperactivity disorders (ADHD). The study adopts the design of Pre-test and Post-test. The study is conducted by six ADHD students. The study lasted for 12 weeks. Every student walked for forty-five minutes in the early morning twice a week. Use the Computerized Attention Diagnostic Test (CADA) as survey tools. The results of the study are as follows: In Post-test, all the scores of Three Factors of Attention, Two Factors, the Reasoning Attention and the Language Attention are higher than the average of ones in Pre-test. Besides, the scores of the Language Attention between Pre-test and Post-test achieve the statistical significance. The conclusion is that the brisk-walking exercise has a positive effect on language attention of junior high school students with ADHD.