As one of the streaming media traffic portals, QRTC products have a complete support system behind them. In the whole system, the core is to ensure the stable operation of business scenarios and the normal presentation of sound and picture quality. What are the practical methods for improving business and sound and picture quality? At the Shanghai station of LiveVideoStackCon 2022 Audio and Video Technology Conference, Liu Shiyao, a senior architect of Qiniu Cloud, analyzed the quality improvement practice behind Qiniu Cloud QRTC in detail.