A Academic performance in children is influenced by cognitive processes, one of the main elements is short-term memory. Brain exercises are a series of movements that can activate short-term memory abilities. Therefore this study was conducted with the aim to determine the effect of brain exercise on short-term memory of elementary school children. The method of this research was analytic study with quasi experimental design, consecutive sampling was taken in elementary school children grade 4, 5, 6 at SDN 1 Badakarya and SDN 1 Bondolharjo with 46 children intervention group was given brain gym stimulation 3 times a week for 3 weeks and 46 controls without stimulation. The research instrument uses the Digit Span test. Data analysis using the SPSS for Windows program with statistical tests, namely the Dependent T test and the Independent-Samples T Test with the significance level used by the amount (p> 0.05). Results In the results of the Digit Span test score before and after stimulation, there were significant differences (p = 0,000) in the intervention group. For differences in the change in scores after brain gym stimulation, there were significant differences between the intervention group and the control group (p = 0,000). Conclusion There was a significant effect on short-term memory in the intervention group at SDN 1 Badakarya given brain exercise stimulation 3 times a week for 3 weeks compared to the control group at Bondolharjo 1 Elementary School which was not given brain gymnastic stimulation.