Zirconia coatings as hydrogen were formed on disk-type ZrH2 substrate by a sol-gel method. Properties of oxide coatings were studied with different precursor concentrations. The phase structure and morphology of oxide coatings were analyzed by XRD and SEM, respectively. The anti-permeation effect was tested by a vacuum dehydrogenation experiment. Results show that the thickness of total oxide coatings varied from 5 μm to 14.3 μm, which increased first and then decreased with the precursor concentration increasing. SEM images of oxide coating morphology and cross section demonstrate the continuous coatings couldn’t be generated when the concentration was set below 1.0 mol/L; however, when the concentration was higher than 1.0 mol/L, particle accumulation and cracks occurred on the surface of the coating and the coating was not continuous. The phase structure of the oxide coating is monoclinic ZrO2 and tetragonal ZrOx. Permeation reduction factor values range from 9.86 to 10.43