When a naval vessel cruises, its motion and temperature load of the sea would affect the missile's solid rocket motor propellant. The naval vessel cruise's kinematic model was established to research this effect. Finite-element method was used to analyze stress, deformation and temperature distribution of propellant under those loads. It proves that severe stress concentration and deformation occurred on the propellant in motion of the naval vessel, and the temperature load slightly affects it, but under coupling of the ship's movement and temperature loads, superimposed stress concentration would be likely to exceed allowable artificial debonding stress, the artificial debonding layer would be damaged, thus, the missile's solid rocket motor would fail.