Carbon nanotubes(CNT) were synthesized by the thermal chemical vapor deposition with the decomposition of acetylene gas in the argon carrier gas under temperature of 700 ºC on Ni or hastelloy substrates. Carbon nanotubes were characterized by X-ray photoelectron spectroscopy (XPS), Raman Scattering, Transmission Electron Microscopy (TEM) and Atomic Force Microscopy (AFM). Field emission properties of well characterized carbon nanotubes was extensively studied. Low turn-on electric field of ~ 1V/um was achieved. Long-term stability of emission was studied. Field emission profile was examined by imaging using phosphor screen. Carbon nanotubes appear to have better field emission properties and stability comparing to Spindt type emitters.