Abstract: Objective To identify the occupational hazard factors generated during the flour production process of a grain depot in Tianshui City,analyze and evaluate the proposed dust and noise prevention measures to be taken based on personnel operation methods and expected exposure levels,predict the degree of occupational hazard,propose key positions and prevention and control measures,and implement them during the project construction phase. Methods In 2021,an investigation was conducted on the occupational hazard factors generated during the flour production process in a grain depot in Tianshui City,using a combination of engineering analysis,analogy,and checklist methods for analysis and evaluation. Results The concentration of grain dust exposed by operators might exceed the standard during grain unloading,the dust concentration in the cleaning and milling processes were lower than the occupational exposure limits（OELs）,and the expected dust concentration in other processes was less than 50% OELs.The 8-hour equivalent sound level of workers exposed to noise in the packaging,cleaning,milling,and mixing processes was higher than 80 dB（A）,but lower than 85 dB（A）,which belonged to noise operation posts. The 8-hour equivalent sound level of workers exposed to noise in other processes was lower than 70 dB（A）,which belonged to non-noise operation posts. Conclusion The dust and noise hazards in the flour processing industry of a grain depot in Tianshui City cannot be ignored. Practical and feasible protective measures such as isolation,sealing,ventilation,and noise reduction should be taken to effectively prevent and control key control posts.

Key words: Flour production, Dust and noise prevention measures, Key control posts