The　enhancement　effect　of　Pr,　Y,　Eu　and　La　on　the　determination　of　Dy　by　air-acetylene　flame　monoxide　flame　emission　spectrometry　is　reported.　The　dual　wavelength　method　(526.3　nm　as　the　analytical　wavelength　and　526.7　nm　as　the　reference　wavelength)　was　used　to　eliminate　spectral　interferences.　A　new　method　was　established　for　direct　determination　of　Dy　(about　4%)　in　rare-earth　mixture　concentrates　using　Pr　as　enhancing　agent　and　chemical　interference　inhibitor.　The　detection　limit　is　0.4　μg　ml-1　Dy　and　the　linear　range　is　5-900　μg　ml-1　Dy.