TiO2　nanotube　arrays　were　fabricated　by　anodic　oxidation　of　pure　Ti　plate　in　the　HF　solution.　The　impacts　of　the　growth　conditions　on　the　microstructures　and　field　emission　characteristics　of　the　TiO2　nanotube　arrays　were　evaluated.　The　arrays　were　characterized　with　field　emission　scanning　electron　microscopy　and　X-ray　photoelectron　spectroscopy.　The　results　show　that　the　anodization　voltage　strongly　affects　the　microstructures　and　emission　properties　of　the　TiO2　nano-tube　arrays.　For　example,　as　the　anodization　voltage　increased,　its　emission　on-set　voltage　varied　in　a　decrease-increase　mode;　and　the　tube　diameter　and　length　increased　with　little　change　in　its　wall　thickness.　The　arrays,　anodized　at　10　V,　were　found　to　have　the　lowest　onset　field,　3.15　V/μm;　and　an　emission　current　density　of　0.85　mA/cm2,　when　biased　at　8　V/μm.　Moreover,　high　emission　stability　for　at　least　6　h　was　observed.