Uniform films of aligned carbon nanotubes were grown on a patteed Ni coated ceramic substrate by microwave plasma chemical vapour deposition(MWPCVD).A laser writing technique was used to make some pattes on the substrate.The controlled selective growth of nanotubes on the patteed substrate can be obtained directly during the reaction process in the MWPCVD chamber.The Raman spectrum shows a good graphitization of the carbon nanotubes.In the field emission test,tu-on field of 1 V/μm and emission current density of 5mA/cm2at 3.3 V/μm were achieved.