Abstract: (Sm1-XGdX)2Zr2O7 was taken as the research object, and microcrystalline wax was used as the carrier.The cooling barrel wall temperature effect of (Sm1-XGdX)2Zr2O7 was investigated through barrel wall temperature test of 14.5 mm ballistic gun.The results showed that the maximum temperature of inner wall was 957 ℃ without loading (Sm1-XGdX)2Zr2O7 sample.The average value of 5 slopes maximum temperature of inner wall was 869 ℃ with a mass ratio of 1∶2 (microcrystalline wax∶(Sm1-XGdX)2Zr2O7 zirconates)sample, the cooling effect was obvious.The effects of (Sm1-XGdX)2Zr2O7 dosage and explosion pressure on the deposited layer were studied through the closed burst scour test, including dispersion and chemical composition.The results showed that the more the (Sm1-XGdX)2Zr2O7 was used, the thicker the sedimentary layer was at 60 MPa and 2 500 K. (Sm1-XGdX)2Zr2O7 was existed and well dispersed in the sedimentary layer.The greater the explosion pressure, the thinner the sedimentary layer under the condition of 1∶2 mass ratio and 2 500 K, (Sm1-XGdX)2Zr2O7 was existed and well dispersed in the sedimentary layer. Finally, we knew the heat insulation mechanism of (Sm1-XGdX)2Zr2O7.It absorbed part of the heat at high temperature,At the same time the air flow formed by the high pressure condition carried the (Sm1-XGdX)2Zr2O7 scours the inner wall of the gun barrel at high speed.Part of (Sm1-XGdX)2Zr2O7 was deposited onto the inner wall, a uniformly distributed sedimentary layer was formed at the interface junction which played the role of heat insulation protection in a comprehensive way.