我国先后制定了GB 5817—1986《生产性粉尘作业危害程度分级》、GB12331—1990《有毒作业分级》、GB/T14440—1993《低温作业分级》、GB/T 14439—1993《冷水作业分级》、LD80-1995《噪声作业分级》、GB/T4200—1984《高温作业分级》等6项职业病危害作业分级标准,之后二十几年分别对部分标准进行了修订[1]。为了更好地贯彻实施 China has formulated GB 5817-1986 Classification of Hazardous Levels of Productive Dust, GB12331-1990 Toxic Operating Classification, GB / T14440-1993 Low Temperature Operating Classification, GB / T 14439-1993 Cold Water Operating Classification, LD80-1995 “noise operation classification”, GB / T4200-1984 “high temperature operation classification” and other six occupational hazards operating grading standards, after two decades of some of the standards were revised [1]. In order to better implement