Abstract: With the rapid development of the 3G telecommunication, users require video communication and conference all the time and everywhere. This article introduces a video interactive system based on 3G telecommunication network. It uses 3G cell phone to access Internet. It adopts several key technologies: interactively encryption of P2P and video stream, multichannel and multipicture parallel video stream, terminal short message auto startup. These make it possible for high quality video communication with 3G cell phone. It is of good using effect in practical application.

Key words: 3G telecommunication, video conference, P2P, multithread