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Aiming at the ballistic target during flight surface temperature is the focus of missile attack and defense, the surface temperature and infrared radiation source of ballistic target in atmosphere outer are briefly introduced. A method for calculating the surface temperature of an atmosphere outer ballistic target during flight is proposed. Focusing on the typical thermal parameters of warhead and decoy and the atmosphere outside the surface of the different initial temperature, were calculated respectively in the shadow area and sunshine area warhead and decoy surface temperature with the change of flight time, found the warhead thermal inertia is big, basic to keep the initial temperature, decoy thermal inertia small, quickly will reach equilibrium temperature, and an example is used to verify it.