Abstract: This article discusses a structure of air-borne fast displaying system based on digital signal processing（DSP） and field programmable gate array（FPGA）, and introduces a new FPGA-based hardware filling method of dynamic image. In the process of filling image, DSP is used to indicate the boundaries of filling area in the image. Then FPGA is used to fill the area. This method leads to high speed of renewal. Moreover, the time of renewing image does not change with the changing of renewing area.