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To solve the problem that single line scan camera loss of light in the edge of the sensor when the field of view is large, this paper designed a mosaic line scan CMOS camera system and proposed a solution of using multiple relatively low pixel cameras to share the field of view in order to reduce the single camera view angle. The structure of the system and the drive of the chips were introduced detailed .In addition,an algorithm of calibrating image based on FPGA was researched, and data was transported to the image acquisition software via a high-speed USB chip . Experimental results show that compared to a single camera , the system has a better image quality in a large field of view , and can be used to detect multiple discrete targets.