Abstract: In general,it is possible to extend the current linear lifting surface methods for calculating the unsteady aerodynamic forces on lifting surface to calculation of the wing-aileron-tab configuration.But owing to the limits of the methods and capacity and computational speed of the computer,it is often dif-fcult to predict accurately the unsteady aerodynamic forces on lifting surface with a control surface and a tab which covers a little portion of main surface.So far,there appears few of three-dimensional unsteady aerodynamic methods which can analyze the tab flutter satisfactorily.Also,it is rare to find successful numerical examples of three-dimensional aerodynamic forces and flutter for a wing-aileron-tab configuration.The residual downwash methods proposed by W.S.Rowe and others（4）,（5）can be used to calculate a wing-control surface configuration with discontinuous downwash distribution,but they are very complicated and need a huge amount of calculation.An analysis of unsteady aerodynamic forces and flutter for a wing-aileron-tab configuration by doublet-lattice method is presented in this paper.The six cases with box numbers 41,68,92,130,154 and 182 respectively have been calculated.In this range of box numbers the maximum variance of the flutter velocity and flutter frequency are 6.92% and 2.24% respectively.The difference between calculated and experimental flutter velocities is 18.8% to 24.4%.The results show that this method provides good convergence and accuracy enough for engineering.