Two　kinds　of　high　color　rendering　index　light　emitting　diode　(LED)　are　made　by　yellow,　red　phosphor　and　yellow,　red,　green　phosphor　respectively.　The　light　output　of　the　sample　with　green　phosphor　is　bigger　due　to　more　green　light　in　spectrum　after　the　addition　of　green　phosphor　and　the　larger　vision　function　of　green　light　than　that　of　red　light.　The　luminous　efficiency　decreases　and　color　rendering　index　increases　when　the　testing　temperature　varies　from　10°C　to　90°C.　This　suggests　that,　besides　the　degradation　of　internal　quantum　efficiency,　the　mismatch　of　red　shift　of　wavelength　of　the　chip　and　the　excitation　wavelength　of　phosphor　and　the　degradation　of　excitation　efficiency　of　phosphor　at　high　temperature　are　all　the　reasons　of　degradation　of　luminous　efficiency.　The　color　rendering　index　increases　due　to　wider　spectrum　of　blue　light　emitted　by　the　chip　at　high　temperature　which　makes　the　spectrum　smoother　and　closer　to　the　spectrum　of　the　sun.