This paper aims to compare parenting stress among Mothers with ADHD children and normal children. The causal- comparing method was used. The statistical community included 5 to 12 years old children who were referred to child professional psychiatry clinics (I bn-e-sina and Shaykh Doctor Hospitals). All Mothers of normal children (5 to 12 years old) were selected in primary and preschools in the fourth district area of Mashhad by available 50 parents with ADHD children and 80 Mothers with normal children were selected by cluster sampling. The instruments composed of parenting styles Diana Bum scale and index parenting stress (PSI). Data was used from statistical T-test styles in independent groups by, two ways of ANOVAs analysis. Results showed that there was a significant difference between parenting stress in Mothers of ADHD children and mother of normal children .And there was a significant difference between parenting styles among Mothers of ADHD children and mother of normal children .Also there was a significant difference between parenting stress level and parenting styles in Mothers of ADHD, children and mother of normal children And parenting stress level had an effect on selecting parenting styles with ADHD children. In the other words the higher parenting stress is, the more arbitrary parenting styles will be.