Aimed at the stability and following problems for the hydraulic booster-control surfaces system in an aircraft,referred and consulted to the linear research method provided by existed authorized documents,the non-linear simulation model of booster was built and simulated.The results show that the existed linear model is not enough using for the booster system design,while the nonlinear model comes more near to the real mechanism condition of system.When the condition allowed,a supporter for the booster and an elastic model for the control surface should be built at the same time.The research results make a reference for the design of the booster-control surfaces system.