Multi-wall carbon nanotubes（MWNTs） are prepared by using screen print;the interdigitated Ag electrodes are made on glass base by magnetron sputtering.The volt-ampert characteristic and resistivity of MWNTs adsorbed glycine are detectied at room temperature.The electrical conductivity of the carbon nanotubes film is increased.When the electrode is exposed to glycine

and the increasing amplitude of conductivity associated with the glycine concentration.This results show that MWNTs are promising sensing materials for glycine detection at room temperature.The mechanism of the electrical conductivity change for carbon nanotube film absorbed glycine is discussed preliminary.