【正文】 stem and so on, these systems need the puter to provide the realtime tendency all, the effect lifelike picture. 1 Introduction Meeting of human society an integral part of economic life, the study shows that approximately 55% of the effectiveness of munication depends on the face (facetoface) of the visual effects, 38% rely on talking voice, audiovisual people The most important form of access to information, and face to face discussions (facetoface) is the most abundant human expression of ideas way. Since the industrial revolution, the technological advancement made a breakthrough progress in munication technology, telephone and telegraph invention of the distant sound of people and documents can be sent immediately. However, in addition to verbal munication, the human beings pay more attention to facial expressions and body expression, only voice transmission has been unable to meet the needs of modern munication, realtime video and interactive delivery of information more real and natural. (1) video conferencing system is in this generation, driven by an urgent need for a new generation of munications products. Video Conferencing (VideoConference) system is a can sounds, images, text and other information sent from one place to another munication system. Effective transmission of videobased information on a remote sector and intersectoral cooperation, and also can be achieved, such as video conferencing and video applications such as video on demand technology. Video conference system is the puter technology and munication technology product of the bination, multimedia munication technology as an important part of being affected with the rise of the global information superhighway and has developed rapidly. Video conferencing has been thirty years from the emergence, from the beginning to reduce travel costs, improve efficiency, to 911 domestic and international collaboration to accelerate the time to protect the personal safety, to safeguard social stability during SARS and the minimum work operation, the advantages of video conferencing is increasingly widely displayed. (2) In view of the video conference system in the military, economic and cultural fields, the enormous role of the human and economic, national research and development of peting video conferencing systems, especially in very large scale integrated circuits, pression algorithms and visual physiology research breakthrough has been made and on a series of international standards for video conferencing were introduced, and a variety of image processing chips have the introduction of realtime video conferencing systems have e a long way before the practical development. The main application at home and abroad are: Business Communication Business Conference Enterprise customer service and product development Distance learning and technical training Market research and intelligence gathering Telemedicine and consultation Cooperation in scientific research and engineering design Multinational application Staff recruitment From the current perspective of the development, research on a lot of video conferencing technology, the products are very rich, although very attractive video conferencing system has broad prospects, but in this area there are considerable technical issues to be resolved, video conferencing systems at this stage of practicality, versatility and friendliness of the relevant technologies and related issues: software technology, database technology, work technology, sharing of technology, resource control, security technology and technology conference model. (3) The main research topics is the way of software, with the necessary peripherals to achieve a small video conferencing system. 2, the basic principles of video conferencing systems Video Conferencing (VideoConference) system is the basic definition: two or more individuals or groups of different geographic location, through the transmission line and multimedia equipment, the sound, image, video, interactive video and file transfer data, to instant and interactive munication in order to plete the purpose of the conference system. Be