This study was carried out to determine the effectiveness of colour overlays among children with behavioural disorder who are experienced Irlen Syndrome symptoms. 20 subjects aged between 7 to 12 years old from Special Need's Class at Sekolah Kebangsaan Dato Haji Musa, Kota Samarahan, Sarawak, Malaysia involved in this study. A quasi-experimental design of pre and post-test was conducted to compare the findings between the application of blue colour overlays and without colour overlays in term of reading score and reading time. The findings through the paired samples t-test analysis found the significant differences for reading score, t (19) = 3.923, p = 0.001 and reading time t (19) = 4.081, p = 0.001. The findings indicated that there is a significant improvement in term of reading score and reading time as shown in dyslexia children, followed by ADHD and other learning disabilities with the symptoms of Irlen Syndrome while using blue colour overlays. This study had disclosed that blue colour overlays can help to increased reading comfort in children who having a behavioural disorder and experienced the symptoms of Irlen Syndrome.