The real-time flight test data monitoring system is a crucial means to ensure the safety of civil aircraft test flights and to verify the effectiveness of flight tests. Typically,the system uses S-band telemetry to transmit data to the ground,with a monitoring radius generally not exceeding 300 km. Data quality is easily affected by flight attitude,altitude,and airspace terrain. A new real-time flight test data monitoring system has been designed and developed based on a C/S （Client/Server） architecture,employing satellite communication for air-to-ground communication. The system consists of a server-side and a client-side; the server-side is deployed in the airborne environment,continuously listening for data subscription commands from the ground client-side. The client-side is developed using the WPF （Windows Presentation Foundation） framework and the MVVM （Model-View-ViewModel） pattern,integrating components such as IoTDB,GMAP.Net,and FFmpeg. This allows for the visualization of key flight test parameters,real-time flight trajectories,alarm information,and airborne video. During testing,the systems client-side operated in Shanghai and successfully monitored the entire test flight process of a domestically-produced regional jet in Nanchang in real-time. The system ran stably and reliably,providing a solution for conducting special flight test missions.