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In this paper, the procedure of preparation of graphite-Teflon composite electrode(GTE) by coating was investigated. The coating consisted of a solid mixture 2.5 g(graphite45%, Teflon 45% and PVC 10%) mixed with a solvent (THF: DMF=1:4 in volume) 0. 8mL. Copper wires(=0. 7 mm) were coated by the coating and heated at 200℃ for 5 min,and the GTEs were finished. They could be modified and changed into other metallic Tefloncomposite electrode only by electroplating in correspondent plating bath, such as mercury-cobalt- or copper- Teflon composite electrode. They had been applled to flow injection analy-sis by techniques of electrochemitry successfully.