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Nowadays research on micro and nano electronic device based on carbon nanotube (CNT) raises much interest among researchers,but in the fabrication process,crucial problems exist in making and improving the electrical contact between CNT and microelectrode.Here pulse gas alignment method,combined with manipulation technology based on atomic force microscope (AFM) if needed,is proposed to assemble and make electrical contact between CNT and microelectrode.After the assembly,a processing technique of applying sweeping voltages is performed for producing electrical current induced local Joule heat,which is supposed to decompose and remove the sodium dodecyl sulfate (SDS) molecules adsorbed on the CNT or at the interface region,to reduce the contact resistance between CNT and microelectrode and thus to improve the electrical contact.Experiments of assembly and improvement of electrical contact between small-diameter multi-wall carbon nanotube and microelectrode are performed to verify the effectiveness of the proposed methods.