The fuel consumption performance of aircraft is directly related to the deployment capacity and profitability of airline. According to the actual aircraft flight data, we established an exponential attenuation function model of aircraft fuel consumption performance. Based on the feature that the attenuation speed varies with each component of fuel consumption performance, the GIP algorithm of NHD and RELAX algorithm were introduced to realize the separation and parameter estimation of each component of fuel consumption model. The CRB analysis of the experiment results proved the accuracy of the parameter estimation, and the A330 flight data proved the effectiveness of the algorithm. This method provides a reference criterion for aircraft fuel consumption performance evaluation.