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 In order to study the current condition about noise pollution in the steel mill, a noise measurement system was applied to collect the sound data of the equipments in the steel-quality-testing workshop, the steel-making workshop and the steel-rolling workshop. And the sampling frequency was set to be 44,100 Hz. Then, the FORTRAN source codes were applied to obtain the noise signal octave diagram and the total sound level in order to find the noise frequency distribution cha-racteristics of each device. The experimental data showed that the greatest noise appears in the cutting bed of steel-quality-testing workshop, RH furnace of steel-making workshop and straigh-tening process of steel-rolling workshop, and the noise strength reaches 98.46 dB (A), 101.04 dB (A) and 100.44 dB (A) respectively. Further, their key noise frequency scopes focus on 250 - 8000 Hz, 1000 - 16,000 Hz and 250 - 8000 Hz, and their contributions to the total sound energy are 76.56%, 64.68% and 76.67% respectively. The noise of the casting key-control room is the greatest in all lounges of the steel mill. The total sound level reaches 87.54 dB (A); the key noise frequency ranges from 63 to 2000 Hz; and the contribution to the total sound energy is 73.09%. Therefore, the noise reduction scheme should be designed to deal with the three workshops and key-control room. The workers should wear acoustic earplugs when working in the workshops. The sound insulation walls and windows are installed in the key-control rooms.