The key components modeling techniques of variable cycle engine(VCE) were studied. Two fans of VCE were divided into tip and hup sections during modeling process to suit the characteristic of VCE. The relationship between the valve opening

the bypass inlet total pressure

the dynamic pressure and total pressure recovery coefficient of bypass was got based on flow field analysis

and modeled by intelligent network. The co-working equations between components of VCE were set up. Then the component-level model of VCE was got. The bypass model was improved. The design point calculations were completed based on the European Space and Propulsion System Simulation Database

and simulations were carried out. The results of simulations indicate that the mathematical model exhibits the same performance as the actual engine experiment. At low Mach number

the double bypass mode achieves higher thrust and lower specific fuel consumption

and at high Mach number

the single bypass mode shows higher thrust and lower specific fuel consumption. So the modeling method of VCE proposed is feasible.