Abstract: Studies have suggested that relaxation therapy can help children with ADHD to reduce their hyperactivity. This study aims to find out the changes on the absolute power of alpha and theta brain waves of Attention Deficit and Hyperactivity Disorder-Hyperactive Impulsive (ADHD-HI) case and attention factors are also analyzed by applying relaxation therapy as an intervention programme. The experimental sample for the present study was a single ADHD-HI case and control group for comparison with quasi experimental approach. Brain waves of the control samples including the experimental case were recorded for pre test using Electro Encephalogram (EEG) along with attention scores and relaxation therapy was given for the experimental case alone and post test was recorded on brain waves and attention scores again. Statistical analyses were done on the different brain waves. It is found that increase in alpha, theta and attention scores of the ADHD-HI case.