The new generation of lithium aluminum silicate glass has gradually become the main structural material of aerospace transparent. Due to high elastic modulus and excellent ion exchange capacity, it has excellent mechanical performance after chemically strengthened, which can well meet the lightweight and high strength requirements of aerospace transparent. In this paper, 1.8 mm thick lithium aluminum silicate glass was taken as the research object, and the impact resistance of chemically strengthened glass was studied. The influence of center tension on the impact resistance is discussed by theoretical calculation based on the stress profile. Glass samples were prepared by different chemically strengthened processes for the falling ball impact testing. The results show that the impact resistance is excellent when the compressive stress is approximately 930 MPa and the depth of layer is 130～160 μm, and the 1.8 mm glass has good mechanics performance.