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Organic aprotic polar solvent EtMgCl/THF solution was prepared as magnesium electrodeposition electrolyte, and the initial electrochemical deposition of Mg film electrodeposited on Cu matrix was investigated by cyclic voltammetry (CV). The results show that the deposition of Mg film follows the mechanism of nucleation and subsequent grain growth. The bright, compact and uniform coating of magnesium was obtained by DC (direct current) deposition for changing the electrolyte concentration and current density. The surface morphology and phase composition of the coating were characterized by D8 XRD and SEM respectively. Compared with DC, the grain size by PC (pulse current) are more finer, and the results manifest a preferential orientation of the Mg crystallites parallel to the [002] crystallographic planes.