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As the most important product in the civil aircraft flight test process, flight test data is the basis for showing compliance and verifying the rationality of the design. In the traditional mode, it is necessary to unload the original data in the on-board recorder after the flight, and complete the conversion of the test flight data amount through 4-5 hours of preprocessing, which is time-consuming and labor-intensive, which seriously affects the test flight efficiency.Based on the actual flight test scenario, this paper puts forward the concept of real-time flight test data preprocessing in the airborne environment, adopts ultra-high-speed thread parallel processing technology, integrates the IoTDB time series database, and designs and develops an online complete preprocessing system for airborne data.After experimental tests, the system realizes the real-time reception, preprocessing and database storage of the 200Mbps test flight data stream of a large domestic passenger aircraft, compresses the previous preprocessing cycle to 20 minutes, and supports the requirements of high-intensity and high-density test flight.