The 'Korea Health Panel Online Survey System' was developed to improve the accuracy of medical utilization data collected in the Korea Health Panel Survey and to increase the efficiency of the survey by making panel households of the Korea Health Panel submit medical receipts and other documents through a mobile app on their smartphones after using medical services. Development has been underway since 2020 and is currently being used in various ways in the Korea Health Panel Survey. This report summarizes the development process of the Korea Health Panel online survey system and the operational performance from 2020 to 2024, and presents a plan for its further development.