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In this article, the branch carbon nanotubes film was deposited by chemical vapor deposition (CVD), using a gas mixture of nitrogen, hydrogen and acetylene, the catalyzer is Ni film which was electroplated in the solution of NiSO4·6H2O, a little FeNO3 and H3BO4 in deion water with TEOF (Si(OC2H5)4). The SEM and TEM have been used to determine the structure of the films, which show that the diameters of the nanotubes are about 50nm. Field emission characterization has been measured on the carbon nanotubes films-anode setup in a vacuum chamber (p∼10-5Pa). The Fowler-Nordheim plot shows a good linear fit, indicating that the emission current is field emission.