Abstract: This paper focuses on the problem of determining the mixed weighted sensitivity function for the plant uncertainty with multiplicative output perturbation, extends the loop shaping approach derived from classical control theory to the control design of the multivariable mixed weighted sensitivity, and presents a constructed method of the equation with an adjustable bandwidth for the frequency shaping of the weighted function which can trade off the design specifications between time and frequency domains. It is shown that the performance of a control system can be improved by means of tuning the bandwidth. Simulations on the nonlinear model of the twin spool turbojet engine aerothermodynamics are conducted to verify the disturbance rejection and tracking performance.