Within this review, based on the mechanism and effect factor of technological parameter of micro-arc oxidation( MAO) , the existing technologies of MAO were comparied. The progresses in preparation of nano-hydroxyapatite on MAO coating by post-processing technologies supported on magnesium substrate including electrodeposited technique, electrophoresis deposition and pre-calcification procedure were summarized. The prospect of the preparation of synthesis of hydroxyapatite was forecasted.