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Confined etchant layer technique (CELT) has been proved an effective electrochemical microfabrication method since its first publication on Faraday Discussion in 1992. Recently, we develop CELT as an electrochemical mechanical micromachining (ECMM) method by replacing the cutting tool used in conventional mechanical machining with an electrode, which can perform lathing, planing and polishing. Through the coupling between the electrochemically-induced chemical etching processes and the mechanical motions, ECMM can also obtained regular surface in one step. Taking the advantages of CELT, the machining tolerance and the surface roughness can reach to micro- or nano-meter scale.