Magnesium　alloys　were　commonly　used　in　the　industry,　but　their　lower　corrosion　resistance　limited　to　their　application.　In　this　work,　an　iron　tetradecanoate　(Fe(CH3(CH2)(12)COO)(3))　coating　was　on　the　surface　of　Mg-7Li-3Al-1Si　alloy　prepared　using　an　environment　friendly　method　by　one-step　in　order　to　improve　the　corrosion　resistance　of　Mg　alloy.　Results　showed　that　the　prepared　coating　has　an　ideal　corrosion　resistance　and　a　good　protection　performance.