提高模型精度以及保证方程求解收敛是目前发动机建模亟待解决的问题。该文以双转子加力涡喷发动机的数学模型为例，介绍了线性状态空间模型的建立，提出了一种根据发动机进口参数进行飞行包线区域划分的方法，在应用该方法得到的飞行区域内，发动机模型的结构参数摄动最小。关 键 词 航空发动机; 数学模型; 线性状态空间; 飞行包线Abstract Improving models’ precision and ensuring equation’s resolution constringency are two unresolved problems in engine modeling. The mathematical model of twin-rotor accelerating turbo-jet engine is taken as an example to illustrate the modeling of linear state-space model. A method is proposed for dividing the flight envelope into a number of sub-regions in witch the perturbations of aeroengine model are relatively small.Key words aeroengine; mathematical model; linear state-space; flight envelope