中文摘要：

音视频质量评价是视频会议系统建设的重点和难点，也是用户体验的关键点。分析了视频会议关键技术，系统梳理了影响音视频质量的各个环节，在此基础上提出了新的质量评价综合体系，将评价过程划分为网络编码码流、重建音视频流和会场音视频现场质量评价三个层次，供各级视频会议系统建设参考。

英文摘要：

Audio-video quality evaluation is the key and difficult point of construction of video conference system and user experience. This paper analyzes the key technologies of video conference and systematically summarizes the key factors that influence the audio-video quality. And a novel quality evaluation system is proposed to evaluate network coding bit stream, reconstruction of audio-video stream and audio-video quality in the conference hall separately. The new system can be used for various construction of video conference system.