Regarding laser-guided bomb, the occasion of attitude control after aircraft-missile separation was analyzed and deduced by using separation safety theory of airborne weapon and the method of steady control in this paper. This method of attitude control in felicitous timepoint can restrain attitude change of bomb by executing rudder deflection, so it guarantees that the attitude of missile during separation from aircraft is always effectively steady. The digital simulation was compared with the attitude curves of missile without control. The simulation results prove that the occasion of attitude control has been introduced could greatly improve security of missile's separation from aircraft.