Introduction: The purpose of this research was to compare the working memory performance in dyslexic and non-dyslexic students and investigate the effect of rehearsal on working memory performance in dyslexic children. Method : This is a quasi-experimental study. Statistical sample of research consisted of 15 dyslexic students who were selected by achievable method as test group and 15 normal students who were selected randomly as control group. These groups matched upon to age mean and academic grade. Data was collected by working memory test battery for children (WMTB-C) designed by Pickering & Gathercole. Rehearsal performed on dyslexic group. Results: Performance of working memory in dyslexic students was weaker than normal students. Conclusion: Rehearsal does not have a significant effect on working memory performance of dyslexics.