Zirconium Boride is widely used as thermal protection materials. However, the characteristics of poor oxidation resistance of ZrB 2 at high temperatures limits its applications. In order to improve the anti-oxidation performance of ZrB 2 , a novel method of doping LaF 3 is adopted in present study. In the synthesis process of ZrB 2 via carbothermal reduction method, LaF 3 was introduced to the initial materials. Motivated by the slightly higher formation temperature of ZrB 2 than the melting point of LaF 3 , a liquid glass phase composed of F and La was deposited on the surface of ZrB 2 , which naturally brought in oxygen starvation and contributed to improved oxidation resistance performance. The crystal lattice parameters and the anti-oxidation ability of ZrB 2 are closely dependent on the added LaF 3 content, which can ascribe to La3+/Zr2+ substitution and the amount of glass phase on the surface of ZrB 2. [ABSTRACT FROM AUTHOR]