Abstract: According to the relation of image quality and its signal-to-noise ratio, the system behavior with frequency modulation is forecasted theoretically. By the use of current technologies, an analogue communication system at W-band is developed, which can be applied to video link. System experiment results are also given. The scheme and the essential technology of the system are recommended. The levels of millimeter-wave components applied to the system are described, which include oscillator, mixer, duplexer and antenna, et al. The system is cost-effective, stable and reliable, and its communication distance exceeds 8 km with image quality of 4.5-class.