The　Ca　addition　in　Mg　alloys　significantly　raises　the　ignition　point　of　the　magnesium　alloys　in　air.　The　oxidation　resistibility　of　magnesium　alloy　at　elevated　temperature　could　be　increased　by　adding　a　small　amount　of　Ca.　The　effects　of　Ca　addition　on　mechanical　properties　of　different　magnesium　alloys　are　different　at　ambient　temperature.　The　elevated　temperature　strength　and　creep　property　of　magnesium　alloys　can　be　improved　by　the　Ca　addition.　Moreover,　Ca　is　an　effective　alloying　element　to　enhance　the　corrosion　resistivity.　The　magnesium　alloys　with　Ca　element　is　hopeful　of　becoming　one　kind　of　new　promising　light-weight　heat-resistant　alloys.