White　powder　light　emitting　diodes　(LED)　with　different　color　temperature　were　made　by　using　different　ratio　of　yellow　to　orange　silicate　phosphor.　When　the　ratio　of　yellow　to　orange　phosphor　was　less　than　7,　the　peak　wavelength　of　yellow　light　in　spectra　was　about　570　nm　and　the　wavelength　was　about　590　nm　as　the　ratio　was　greater　than　7.　With　the　color　temperature　increasing,　the　color　rendering　index　and　the　luminous　efficiency　increased　at　the　beginning　and　then　decreased.　And　color　temperature　of　5　521　K　is　the　optimal　value.　The　reason　was　the　ineffective　excitation　of　blue　light　due　to　higher　concentration　of　phosphor　and　excess　red　light　in　spectra.　In　contrast,　blue　light　was　not　excited　effectively　and　red　light　in　spectra　was　little　when　the　color　temperature　was　higher　than　5　521　K.　The　luminous　efficiency　was　decreased,　and　the　decreased　magnitude　was　inconsistency　with　the　testing　temperature　from　10　to　80　degrees　C.　This　suggests　that,　besides　Auger　recombination,　the　decrease　in　excitation　efficiency　of　yellow　and　orange　phosphors　is　different　as　the　temperature　rises　and　orange　phosphor＇s　temperature　characteristic　is　superior　to　that　of　yellow　phosphor.