This paper introduces IP multicast technology in brief, and gives the project of testing the quality of video transmission on Internet with IP multicast technology, and implements it with Visual C + + 6.0 and WinSock.

• 简要介绍了IP多播技术；给出了用IP多播技术测试在Internet网上传输视频的质量的方案；并用VisualC++6.；0和WinSock实现。