There are more than two hundred arbitral institutions in China. Some of them are active in the development of online arbitration system, such as CIETAC and Guangzhou Arbitration Commission(GAC). GAC, founded in 1995, is the second largest arbitral institution in China which accepts more than 4,000 cases a year. With extensive experiences in arbitration, GAC has conducted online arbitration procedures since 2007. Moreover it opened the whole process of online hearing to the public through the Internet. With this background, this article aims to support the development of online arbitration through the analysis of GAC practices. To meet the purpose, status quo, rules and procedure of online arbitration of GAC are outlined, followed by introducing nine cases conducted by GAC. The scope of GAC online arbitration is comparatively narrow and the institution is still under the government supervision. But the practices of GAC proved that online arbitration is fully admissible and effective under the current legal framework.