On　the　basis　of　the　investigated　enhancement　effect　of　La,　Nd,　Eu,　and　Y　on　Sm　determination　with　monoxide　molecular　emission　spectrometry,　La　was　selected　as　enhancement　agent　and　chemical　interference　inhibitor.　In　the　presence　of　La,　dual　wavelength　method　was　introduced　to　eliminate　the　spectral　interference　on　Sm　by　other　elements.　A　new　method　is　established　to　determine　samarium　in　high　yttrium　rare　earth　samples　with　satisfactory　results.