Abstract: The fuzzy logic modeling of rolling moment is established with different modeling variables,based on the wind tunnel test results of large-amplitude yawing motion and rolling motion.The effects of different variables on the model precision are analyzed.Using reasonable variables obtained from above,the unsteady aerodynamic model of yawing-rolling coupled-motion is set up by means of the fuzzy logic,and the aerodynamic coefficients are acquired.Comparing calculation results with test results,the influence of model accuracy by variables of different combination is investigated.In spite of any motion forms,the relationship between variables is the main factor that influences the model precision.Considering single freedom motion,α,β,ω_y（ω_x） should be selected as modeling variables;likewise,α,β,ω_x,ω_y regarded as modeling variables are better than others for coupled-motion.