[Conclusion]Hearing protection training can improve the protetive knowledge levels of workers;the enterprises should enlarge hearing protection training coverage and carry out targeted training with comprehensive and foucs contents on workers with long service and low level of education.

It is of strong strategical significance to explore and utilize the preventive potential of urban underground space reasonably.

Based on understanding the importance of development and utilization of prevetive potent als of underground space for civil use and the strategy at the new pe- riod , the development of preventive potential of civil underground projects such as base- ment , metro , common trenches , untderground passages and underground garages , having high value in prevention was suggested .