The relationship between flight fuel consumption and its influencing factors is analyzed by using fuel consumption as an environmental indicator of civil aviation flight operations. By comparing with the fuel consumption estimation method of the European Environment Agency (EEA), it is found that the planned fuel consumption of airlines is generally higher than that of EEA, and then the impact of aircraft types, route distances and load on the planned fuel consumption of airlines was studied. In addition, the difference in fuel consumption between full-service and low-cost airlines was compared. The results show that the longer the route distance and the larger the size of the aircraft, the higher the fuel efficiency of the flight. The fuel efficiency of different types of airlinesis significantly different.The fuel efficiency of full-service airlines is lower than that of low-cost airlines.