Abstract: The properties and the latest progress of different kinds of phosphate chemical conversion films used for magnesium alloys are reviewed in this paper. In addition, the research status of the application of the phosphate conversion coatings on biologic and medical magnesium alloys is introduced. Finally, based on the problems analysis of phosphate conversion coatings on magnesium alloys, it is proposed that the research trends should be emphasized on the processes controlling, formation mechanism, corrosion mechanism, etc.