Abstract: The optimization of installation performance was completed by the comprehensive optimal method for the high thrust-weight ratio turbofan engine.The propulsion system performance model of the variable geometry turbofan engine served as the base,and the maximum of install thrust,minimum of install SFC and minimum of the inlet temperature of turbine were taken as the optimization modules respectively.The calculation and the following analysis showed that the propulsion system performance can be improved significantly by multiple parameter performance seeking control for the turbofan engine with afterburner.The improvements are as follows:(1)the supersonic cruise install thrust can be increased by about 8% on the module of maximum thrust;(2)the subsonic cruise install SFC can be decreased by 2% on the module of minimum SFC;and (3) the turbine inlet temperature can be lowered by about 25 K at the constant install thrust on the module of minimum temperature.