Objective The "tri-simultaneity" (design, building and use)work of occupational-disease -prevention facilities of construction projects in a district of Shanghai were investigated, to find out the problems in the implementation of policies, and to put forward corresponding countermeasures and suggestions.

Methods A sampling survey was conducted on 60 construction projects, in which tri-simultaneity of occupational-disease-prevention facilities must be implement according to the national policy, in a district of Shanghai from 2015 to 2018. Their economic type, industry category and risk category, the status of work on design, building and use of occupational-disease-prevention facilities at different stages, and the quality of technical service reports of these construction projects were analyzed.

Results Among 60 surveyed construction projects, the work on pre-evaluation of occupational hazards was done in all projects; protective facilities design was done in 53 projects (88.3%); the work on evaluation of control effect was done in 47 projects (81.0%); and work on acceptance of completed project was done in 39 projects (67.2%). The difference in the work on protective facilities design and evaluation of control effect were noted among construction projects with different risk classifications of occupational hazards (P < 0.05);and the higher the risk of occupational hazards, the better the implementation. It was noted that there was no difference of tri-simultaneity work among projects with different investment types (P>0.05). There was no difference in the implementation rate of completion acceptance (P>0.05), which was low. There were some quality problems of technical service reports, but no significant quality difference noted among projects with different risk categories or prepared by different institutions (P>0.05).

Conclusion The occupational health supervision department should strengthen the publicity and implementation of relevant laws and regulations on the "tri-simultaneity" of occupational-disease-prevention facilities, supervise the construction units and the occupational health technical service institutions on this work, and improve the execution and quality, so as to better prevent from occupational diseases.