Abstract:An analysis of the thermodynamics behavior of the ZrB2-glass ceramic and the phase and microstructure of the oxidation scale during the oxidation process was reported.The results indicate that the ZrB2 is oxidized to generate ZrO2,B2O3 glass phase,the oxidation product ZrO2 react with SiO2 to form ZrSiO4 during the temperature between 1000°C and 1400°C.when the temperature below 1177°C(1450K),the oxidation scale mainly contain ZrO2,B2O3 glass phase,ZrSiO4.when the temperature exceed 1177°C(1450K), the B2O3 glass phase evaporated ,at the same time,the SiO2 glass phase has good fluidity ,the oxidation Scale mainly include ZrO2,SiO2 phase ,ZrSiO4.the reaction products,B2O3phase,ZrSiO4 and fluidity SiO2 phase all have an excellent resistance for the process O2 diffuse into the matrix.