The purpose of this study is to investigate the effect of group jump rope program for 12 weeks on working memory and attention in elementary school students. In order to achieve the purpose of this study, we conducted a task memory test for fifth grade students at J elementary school in T city. The participants were 24 students which they were divided into 2 groups randomly(EG: 12, CG: 12). The exercise program was performed for 40 minutes, 3 times a week for 12 weeks. The t-test was used to analyze the differences within and between two groups. After the experiment for 12 weeks, there were a significant differences statistically in number of memorization, sequential connection, arithmetic(working memory) in exercise group and sequential connection in control group. There was a significant difference between two groups in sequential connection. After the experiment for 12 weeks, there were a significant differences statistically in P and C, but no differences in the control group. There was a statistically significant difference in Q and C between two groups. In conclusion, the 12-week group jump rope program was an effective program to help improving working memory and attention in fifth grade elementary school girls. It can be used as an important data for development of exercise program.