Abstract:With the increase of air traffic flow, to propose the reference indicators in order to alleviate the congestion as well as the inefficiency of the airport terminal airspace, this paper proposes a new approaching efficiency index of the terminal airspace based on aircraft fuel consumption and extend the currently used approaching efficiency index based on flights’ travelling time in terminal airspace, so as to evaluate aircrafts’ energy-saving, emission reduction issues and approaching efficiency. This paper firstly defines the flight efficiency index of the terminal area based on fuel consumption, and uses ADS-B data to extract the arrival flight trajectory data within 40 nautical miles centered on Tianjin Airport, which is clustered by using K-means method. Then, the BADA model is introduced to calculate the fuel consumption of the arrival flight of Tianjin Airport in August. The approaching efficiency of Tianjin Binhai International Airport as well as meteorological and terminal area congestion constraints is analyzed,. Finally, the correlation between fuel efficiency and traditional approach efficiency is tested to prove that the indicator is reasonable.