| The possibility to deposit CrAlTiN coating with high hardness and wearing resistance on magnesium alloy using Closed Field Unblanced Magnetron Sputter was studied by altered the deposition parameters of Bias and deposition time. The thickness, hardness, adhesion, wearing resistance and surface morphology under different bias was tested and analyzed. The mechanism of performance of CrAlTiN coating on magnesium influenced by bias was discussed. The thickness, hardness, adhesion, wear resistance and surface morphology under different deposition time was tested and analyzed. The growing regularity of coating was discussed.The result showed that Bias is a key role decided whether the coating can be deposited on substrate, the CrAlTiN coating couldn't be deposited on magnesium alloy when the bias exceed 65V. Bias range from 30V to 65V: the thickness decreasing and the hardness increasing with the boosting of bias, the changing regularity of wearing resistance and adhesion of the coating under different bias was of uniformity, the coating have the best wearing resistance when bias was in 3 5-40V; the coating compactness boosting up and the hole diminishing on coating surface with increasing the bias; the CrAlTiN coating's histology belong to SZMl while Bias less than 45V and belong to SZMT while bias more than 50V. The coating thickness nearly be in direct proportion to the deposition time; the hardness have no obvious changing while increasing the depositing time; the adhesion andwearing resistance increasing with increasing the depositing time; the coating compactness boosting up and the hole diminishing on coating surface with increasing the depositing time; increasing of the depositing time in the last step of deposition process can apparently improve the wearing resistance.
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