Abstract: This paper surveyed recent development of classified video conference system,introduced a design method of high-definition video conference in complex and confidential network．Combining typical confidential and secure network infrastructure,described in detail a high-definition video conference’s structure,automatic video track and control technology and deployment．Through research on key technologies such as related audio and video encoding,boundary defense,service quality guarantee and security policy configuration,proposed a practical and feasible design method which is successfully applied in projects.

Key words: High-definition video conference,H.264,H.323,Confidential network,Security policy