As for design of impulse magnitude and the distance from the mass center to individual thruster for low-spinning fin-stabilized terminal correction projectiles, 6-DOF model for the trajectory was established. The impulse induced changes of velocity deflection angle and oscillating angular velocity of body axis were derived. An analytic solution to the equation of complex angle of attack (AoA) after thruster operation was obtained. The effect of an impulse on the angular motion of AoA was analyzed. Then, a constraint condition of the impulse magnitude and the distance from the mass center to individual thruster was proposed. Simulation results show that the flight of projectiles may become unstable if the two parameters are chosen incorrectly. Using the constraint condition to determine the two parameters, the maximum value of AoA can be controlled under an allowed value, and the flight stability of projectiles can also be assured.