The work aims to fabricate microarc oxide coating containing ZrO2 phase on TiAl alloy, and study effects of voltage on growth characteristics of microarc oxide coating. TiAl alloy samples were treated in soluble zirconate electrolyte at 480, 500 and 520 V, respectively. Eddy current thickness tester, SEM and XRD were used to observe thickness, microstructure and phase composition of the coating. Thickness of the coating prepared at 480, 500, 520 V was 18, 28, 48 μm, respectively. A small-scale increase in voltage caused a significant increase in coating thickness. Crystal phases of the coating were t-ZrO2 (primary), m-ZrO2, Al2O3, and TiO2. The content of m-ZrO2 increased slightly with the increase of voltage. Micropores and some ceramic particles of varying sizes were observed on coating surface. The pore diameter and coating roughness increased with the increase of voltage. The voltage has minor effect on phase composition of the coating and a significant impact on morphology. High voltage improves coating thickness, roughness and micropore diameter.