In order to objectively and accurately assess the airborne flight posture in the trajectory-based operation(TBO)mode,a flight posture assessment method based on complex network and MFIM-TOPSIS is proposed.First-ly,the precise protection zone of different aircraft types is established by analyzing the risk of lateral collision be-tween aircraft,and the flight conflict network is constructed by using the three-dimensional velocity barrier method,which is close to the TBO air operation environment,based on which six network topology indexes,such as total node degree,average point strength and network density,are selected to build the flight attitude assessment index system.To weaken the influence of the assessment subjectivity,an interaction matrix that can reflect subjective fac-tors-objective factors is proposed.The maximum information coefficient is used to improve the coding of interaction matrix.Finally the flight attitude level status is assessed by using the superiority-disadvantage solution distance method.The simulation analysis and the example analysis of Takasaki Airport show that the evaluation model can accurately assess the air traffic situation and provide auxiliary information for controllers'decision making and com-mand.
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