Aiming at the angle of attack, which is an important influencing factor of infrared guided air-to-ship missile path planning, constraint models of the attack angle were built, including the number of waypoints, distance between two adjacent waypoints, turning angle and pathway distance. An analytical calculation method of the maximum attack angle was proposed. Applying the principle of geometry, the maximum angle of attack calculation model was built, which could be used to solve the pathway with one waypoint, two waypoints and multiple points. Finally, the maximum attack angle under different conditions was simulated when the waypoint number, turning angle and missile range were changed separately. The results show that the maximum angle of attack would increase rapidly as the missile path waypoint increased; it would also increase as the turning angle decreased if the waypoint number was constant. However, the attack angle increased at the expense of the infrared guided air-to-ship missile range.