Modern China is facing a significant national crisis and social transformation. The emergence of parks as a new phenomenon and the shift in social consciousness regarding children have promoted the construction of children's activity areas within parks. This study extensively gathered literature and materials from newspapers, books, and other sources during the Republic of China period to acquire information about the modern Beijing park children's ticket system, related regulations, children's activities, and the construction of venues for these activities, which were then analyzed and summarized. Research indicates that children's sports fields are a prevalent type of children's activity venue in modern Beijing parks, evolving into crucial functional zones that demonstrate adaptability to local conditions and cost-effectiveness. Children represent a vital part of park visitors and are typically afforded preferential treatment. Children's activities emphasize the integration of play and physical exercise, while also highlighting an educational role. This study enhances the research surrounding modern parks and offers suggestions and insights for the current development of child-friendly cities.