The 3D braiding composites is widely used in the field of aviation,aerospace and other high technology because of excellent properties. The resistance of 3D braiding composites to high-temperature is an important application. In this paper, the heat conduction characteristics of a revolving thin wall under high-temperature are obtained through the heat conduction analysis of a 2.5D braiding CFRP engine structure. Then, through the test under the ground state of oxygen enrichment, it is proved that the structure can be used under high-temperature of 950℃ for long time. The consistency of finite element analysis and test results verifies the calculation correctness and the rationality of compensation parameters selection in test. The study has a good guiding significance to the application of 3D braiding composites in engineering.