In　this　paper,　optical　properties　of　the　four　kinds　of　1　W　white　high-power　LEDs　are　investigated　under　the　driving　current　range　of　100-900　mA.　From　the　analysis,　the　internal　reason　for　the　phosphor　conversion　efficiency　varying　with　the　driving　current　mainly　has　two　kinds:　first,　as　the　current　increases,　the　quantum　confined　Stark　effect　causes　a　blue　shift　of　the　peak　wavelength　of　the　blue　chips,　resulting　in　reduced　matching　for　blue　light　and　phosphor;second,　due　to　the　current　increasing　leads　to　device　temperature　rising,　the　non-radiation　of　the　phosphor　is　increasing　and　excited　state　energy　level　is　splitting　seriously,　resulting　in　part　of　the　energy　decreasing,　and　the　yellow　wavelength　presents　red　shift.　By　analyzing　the　combined　effects　of　these　two　factors,　the　law　of　the　phosphor　conversion　efficiency　with　the　current　changes　is　obtained,　and　the　recommendations　to　improve　the　current　characteristics　of　the　white　LED　are　made.