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.