Virtual Studio uses computer-generated scene as its background. It applies computer technology and video compositing technology to combine the actors and the virtual scene seamlessly

and gives audience a full new vision effect. It brings up a revolution to video making. The structure of Virtual Studio system includes three parts: camera tracking

background rendering and video compositing. Its key technology consists of camera tracking

camera switching and focusing

blue room design and background rendering

synchronization and compositing

etc. This paper addresses the structure

technology and some problems of Virtual Studio.