Objective: Developmental coordination disorder is one of the most common movement disorders in childhood, which has destructive effects on executive functions and movement performance and sports progress of children. Children with developmental coordination disorder show several motor deficits. The purpose of this research was the effectiveness of preliminary gymnastics exercises on the executive and motor functions of children with developmental coordination disorder. Methodology: The current research was a semi-experimental type that was conducted with a pre-test and post-test design with experimental and control groups. The statistical population of this research was all students with developmental coordination disorder aged 10 to 12 in Hamadan city in the academic year of 1402-1403. 20 female students with developmental coordination disorder whose disorder was confirmed using Wilson's developmental coordination disorder questionnaire (2007) voluntarily participated in the present study. All participants took part in the pre-tests of working memory, attention and locomotor and manipulative skills. Then, the participants of the experimental group participated in designed preliminary gymnastics exercises (for example all kind of jumping, pull-ups, rolls, balance, stepping, standing, roping) for 12 weeks and three one-hour sessions per week. The participants of the control group also engaged in their daily activities during the research period. The tools of the current research included N-Back working memory tests, Stroop's attention test, and Al-Rich's motor development test. The Shapiro-Wilk test was used to check the normality of the data. Independent and dependent t-tests were also used to analyze the data. Results: The results of the research showed that 12 weeks of preliminary designed gymnastics exercises had a significant effect on working memory, attention and movement skills of children with developmental coordination disorder. Conclusion: According to the results of the research, it is suggested that children with developmental coordination disorder regularly participate in gymnastics exercises to improve their executive functions and locomotor and manipulative skills.