Based on Liaoning meteorological broadband wide area network, the HD video conference system of Liaoning Meteorological Department was established. The system follows the principle of advanced, standardized, safe and reliable, flexible expansion and easy operation, takes the provincial control center as the node, and has the function of high-definition video conference listening, watching, forwarding, and recording, which has been widely used in Liaoning meteorological service system. In this study, the Liaoning meteorological high-definition video conferencing system architecture, system composition, and key technologies to realize the system audio function are analyzed. At the same time, combined with the needs of business development, the new access system of mobile terminal video conference was set up. Finally, taking the audio fault of Liaoning Province HD video conference system as an example, the audio fault tree is established, and the audio stability of the system is quantitatively and qualitatively analyzed by using the fault tree analysis method.