Based on the nonlinear system equilibrium manifold theory

a simplified real-time simulation model for a turbofan engine was developed.According to the engine test data

an engine model

which could represent the states space equation between the engine corrected-states and the corrected fuel and corrected rotate speed

was presented.And a set of simulating result was accordant with the engine test result.In all

the work in this paper shows well trait about applicability

precision and real-time simulation of this real-time simulation model for a turbofan engine.And this model is very suit to the early research for the control systems of the aero-engine.