In order to study intense pulsed emission characteristics of carbon nanotube films (CNTs), CNTs were synthesized on the surface of Cu substrate (Cu-CNTs) by pyrolysis of iron phthalocyanine (FePc). Orientations of CNTs obtained are different from one another. Intense pulsed field emission of CNTs was measured on the 20GW pulse power system using a diode structure. For single pulse emission, the emission current peak of Cu-CNTs increases linearly with pulse field peak, at the applied peak electric field of ～15.5 V/μ; the current peak is ～5.56 kA, and equivalent emission current density is ～0.283 kA/cm2. At the applied peak electric field of ～32.0 V/μ, the current peak can achieve ～18.19kA, and the equivalent emission current density is～0.927 kA/cm2; the ability of emission current of CNTs is obviously better than that reported. In many continuous and similar peak pulse emissions, Cu-CNTs provide with good repeatability of pulsed emission, and present better emission stability.