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Automatic Dependent Surveillance - Broadcast (ADS-B) system is the necessary equipment for General Aviation Surveillance. The ADS-B technology has long been monopolized abroad. The equiment is very expensive and it has some compatible problem with the current technology system. Therefore a small integrated ADS-B system based on FPGA was designed in this paper. Signal pre-processing and data transmission were implemented in FPGA, and data decoding and displaying were done by personal computer in real time. The effectiveness and precision of the data decoding results were analyzed and evaluated by certain relevant tests, and shows that the system has a fast data processing speed, a high decoding accuracy and high integration, which satisfies the specification of receiving equipment and can greatly reduce the cost of navigation for general aviation.