In order to study the influence of rifling and coating on temperature field and stress field distribution of gun barrel in the condition of thermo-pressure coupling, a small-caliber rifle gun barrel was taken as study object and a FEM model of the maximum chamber pressure section with rifling and coating was established based on the ANSYS platform in this paper. The program was written based on ANSYS parameter design language, and then temperature field and transient stress response of this gun barrel during the firing of 10 rounds burst with 600 rpm firing rate was simulated numerically under the cyclic action of high frequency dynamic thermal pulse and dynamic pressure pulse by use of the direct coupling analysis. Then the distribution rule of the temperature field and stress field of the rifled gun barrel were obtained.

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