Abstarct: The current research aimed to develop a strategic plan for the development of children's physical activity in Iran. This research is applied in terms of purpose and mixed method (qualitative-quantitative). The statistical population of the study is the professors of physical education who are knowledgeable in the field of children's physical activity, Provincial physical training assistants of education, the heads of the talent search committees of sports federations, managers and expert coaches of children's play and sports clubs, and members of the sports and physical activity development association of Children formed the Federation of Public Sports formed number of 320 people, which were collected after answering 265 correct questionnaires. The statistical sample in the qualitative part of the research was purposefully selected from among experts baxsed on expertise, experience, and comprehensive and rich information: 19 people. In the quantitative part, the total number was selected. To collect data, documents, and Background literature were reviewed, the Delphi method was used in the qualitative part, strategic council meetings were held, and tools such as researcher-made questionnaires, internal and external factors evaluation matrix, strategic positioning matrix, SWOT matrix, QSPM matrix were used. After analyzing the data, the mission, vision, core values, long-term goals, strengths, weaknesses, opportunities and threats, strategies, and implementation plans were determined. According to the research findings, The field of children's physical activity development was placed in the strategic position of WT with 10 strengths, 11 weaknesses, 13 opportunities, and 10 threats. Using a SWOT comparative matrix, 14 strategies including 3 SO strategies, 3 ST strategies, 4 WO strategies, and 4 WT strategies were extracted and corresponding implementation plans were developed. Among the most important strategies developed are to increase children's sports participation through institutionalizing the culture of play and sports, improving and organizing the distribution of facilities and human and material resources for children's sports, increasing the program-oriented attitude and applying strategic management methods in children's sports and creating The comprehensive monitoring, control, and evaluation system pointed out the performance and safety of children's play and sports centers. Finally, it is suggested that the Association for the Development of Children's Sports and Physical Activity of the Public Sports Federation, As the main guardian of the development of children's physical activity in Iran, using the developed strategic plan, should put it at the forefront of its work and evaluate and control the step-by-step implementation of the plans.