In order to describe the unsteady aerodynamic performance in unsteady movement at high angle of attack, the unsteady aerodynamic modeling method is studied based on the differential equations. The differential equation models of yawing moment and rolling moment are built on the basis of experimental data, including the yawing, rolling and coupled yawing-rolling of flight vehicle. The hysteresis of aerodynamics is analyzed in the conditions of same sideslip angle and different frequencies, then the aerodynamic data of high frequency motion are fitted, and so the aerodynamic differential equation model of high frequency motion is set up. Results show that the model can accurately predict the flight vehicle unsteady aerodynamic characteristics under different flight conditions, and the modeling method has strong engineering feasibility.