This paper establishes a mathematic model of computing attack area with limited condition after well considering engine’s thrust, atmosphere force, fuel consumption, wind, driving delay of rudder and other factors. In order to improve calculation velocity, the following measures is adopted, such as pre-estimate initialization distance, curve fit missile atmosphere parameter with high precision, adaptive variable step to integral missile kinematics equations and golden section method is used to find out near attack area and far attack area. Finally, the simulation is carried out. results indicate hiefly as fellow①attack area far distance climbs up and then declines with target entering angle's increasing,which reaches maximum at 180° degree and minimum at 0° degree;②attack area far distance gets something increase with initial velocity,but the amplification is not obvious; ③attack area far distance declines with altitude's drop.