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China is running a large number of foreign advanced civil aircraft.These aircraft are all equipped with flight data quick access recorders to collect flight data for flight quality monitoring.Besides being able to play a role in airline operation, the daily flight data of civil aircraft can also analyze the design experience and operation characteristics of advanced models through technical analysis.The relevant technical achievements have certain reference significance to the development of domestic civil aircraft manufacturing industry. Actual case analysis shows, the analysis based on QAR data can effectively respond to the design logic embodied in the altitude maintenance control law of the automatic flight phase, which can benefit the design and optimization of the domestic civilian aircraft.