Abstract: Under the service environment of the engine, the silicon carbide fiber-reinforced silicon carbide ceramic matrix composite material (SiC-CMC) experiences high-temperature water oxygen corrosion failure. The environmental barrier coatings (EBCs) on the surface of SiC-CMC substrate were subjected to bench testing, and the highest flame temperature was above 1700 ℃. It was observed that the local melting and peeling of the EBCs and the Si droplets of different shapes appeared on the burner. The failure mechanism of EBCs was revealed and corresponding improvement measures were proposed through analyzing the erosion situation of the burner. The results show that the temperature of the burner substrate reaches 1450~1500 ℃, exceeding the operating temperature of the coating; The low thermal conductivity of the burner substrate results in poor heat dissipation and thermal stress concentration, which may cause the temperature of the burner substrate to exceed the operating temperature limit of EBCs. By using composite processes to improve the density and thermal conductivity of CVI-CMC composite materials, the porosity is reduced to below 5%, and the thermal conductivity at high temperatures is increased to over 15 W/(m·K), which can significantly extend the service life of the components.