Abstract: Pediatric foot diseases have a significant negative impact on children's growth and development. Therefore, intervening with orthopedic shoe insoles is essential for the affected children. Using a mobile APP to customize shoe insoles is a convenient and efficient solution. We firstly reviewed the existing studies and summarized the application progress of 3D printing technology in the field of pediatric orthopedic shoe insoles. Then, based on the 3D printing technology and service design concept, a 3D-printed custom pediatric orthopedic shoe insole APP was developed. This APP integrated many functions such as foot data collection, intelligent matching, and personalized customization, aiming to provide more precise and convenient orthopedic shoe insole customization service. Through this APP, users can obtain personalized and comfortable orthopedic shoe insoles, enhancing the effectiveness of rehabilitation treatment and user experience. The launch of this APP will provide a new solution for children's foot health, with significant clinical and market value.