In recent years, network teaching platform has been more and more popular. First, this article describes the development of domestic and international network teaching platform. Second, the development of network teaching platform in Jiangxi province is introduced. Third, the literatures on the evaluation of web sites’ quality are reviewed. Finally, the quantitative evaluation system is proposed based on the quality evaluation method (QEM) of web sites. The system includes five indices. They are speed, navigability, teaching information, teacher and faculty information, help information. Network teaching platform of major universities are evaluated using these indices. These indices have important value to enhance the quality of network teaching platforms.