In　this　paper,　we　study　the　current-voltage　characteristics　model　of　the　high　power　light　emitting　diode　(LED)　chip.　Based　on　the　particularity　of　the　high　power　LED　chip　and　the　classical　current-voltage　characteristic　model　of　PN　junction,　we　put　forward　a　new　model　of　current-voltage　characteristics　for　high　power　LED　chip　and　its　optimization　model　through　theoretical　derivation,　analysis　and　selection　of　different　basis　functions.　The　coefficients　of　the　two　new　models　of　current-voltage　characteristics　for　high　power　LED　are　then　estimated　based　on　the　least　square　method.　Subsequently,　we　conduct　comparative　study　on　the　actually　measured　current-voltage　characteristic　data　of　high　power　LED　chip　from　three　well-known　enterprises.　The　results　show　that　the　two　new　models　out　perform　the　classical　current-voltage　characteristic　model　of　PN　junction　in　accuracy　with　a　large　margin.　In　particular,　the　experimental　results　from　the　optimization　model　are　highly　consistent　with　the　measured　data　from　the　three　well-known　enterprises.　©　2015,　Board　of　Optronics　Lasers.　All　right　reserved.