To satisfy the needs for testing video process circuit of satellite cameras, this paper researched and designed an image data transformation system of remote sensing camera, which can convert the format of image data processed by video electronic systems and realize the transformation of image data in different modes. Then, the image transformation and realtime imaging will be finished on host computer through Cameralink. This paper mainly describes the major components of the system and the implementation method of FPGA’s modular design. An FPGA of Xilinx XC2V was adopted to make a center unit, the logic of image data transformation is developed with VHDL. The RS232 interface is used to receive instructions from the host computer, and different types of signals are outputted and transformed depending on the instructions. Practical applications show that the imaging result of the system is clear and accurate, the transform system is flexible and can work well. The design meets the requirements of testing video process circuit in several different types of satellite cameras.