This　paper　reports　the　enhancement　effect　of　La,　Pr,　Nd,　Er　and　Yb　on　the　determination　of　Y　(0-400　μg　ml-1)　by　air-acetylene　flame　monoxide　flame　emission　spectrometry.　The　dual　wavelength　method　(613.2　nm　as　the　analytical　wavelength　and　612.9　nm　as　the　reference　wavelength)　was　used　to　eliminate　spectral　interference.　A　new　method　has　been　established　for　direct　determination　of　Y　(1%　and　24%)　in　rare-earth　concentrates,　using　La　as　enhancing　agent　and　chemical　interference　inhibitor.　The　detection　limit　is　0.06　μg　ml-1.　The　enhancement　mechanism　of　La　on　Y　was　also　studied　by　X-ray　powder　diffraction　and　infrared　absorption　spectrometry.　The　results　showed　that　a　compound　of　La　and　Y　was　formed　at　600-700°C.