Aiming at the problem of expected trajectory tracking control during the formation reconstruction of formation-flying spacecraft， the reference model output tracking control law is derived， and the method of solving the control law is given. By applying the principle of polynomial interpolation， mathematical descriptions of expected trajectories are established for typical flight modes， say， linear approximation，fixed-point hovering， and fast fly-around. Using the relative dynamic equation of the spacecraft orbit as the controlled object and the mathematical description of the desired trajectory as the reference model， a state feedback of the controlled object and the state of the reference model are designed for a combined feedforward controller. Numerical simulation shows that the controller has excellent performance with， with fast error convergence and high tracking accuracy. It is thus meaningful in a theoretical sense and also has guiding significance for engineering practice.