The　research　on　monitoring　and　predicting　drivers＇　fatigue　state　has　remarkable　effect　on　prevention　of　traffic　accidents,　using　the　CCD　image　sensor　camera　as　the　image　acquisition　device　of　driver＇s　face　and　the　940nm　infrared　emitting　diode　as　the　light　supplementary　device　and　3-points　light　supplementary　had　been　utilized,　the　light　supplementary　system　had　been　optimized　by　the　experiment　of　infrared　light　supplementary　which　proceeded　by　means　of　combining　the　orthogonal　experiment　and　expert　fuzzy　evaluation.　The　research　result　makes　great　sense　to　the　monitoring　of　drivers＇　fatigue　state　and　traffic　safety