A new video signal display system that has been developed by using special D/A converter,large scale CPLD device is dascribed in this paper.Through using CPLD devics as contrd unit and peripherals interface and FIFO as buffer interface the system can realize video signal real time display and read in parallel.The system has a lot of characters,including high integration and reliability,small volume,simple interface and in system programmability,etc.As the output module,the system has been applied to a multi channel image fasion system to provide fused multispectral images or multiresolution images for monitor in RGB mode.The effect is satisfying.