预防性职业卫生监督工作是通过对新建、扩建、改建的工程项目实施设计审查和验收 ,将有关的卫生条例、规范和标准贯彻到设计、施工过程中。职业卫生监督人员对有害作业进行有效地监督管理 ,目的是把有害因素消灭或控制在项目投产之前 ,避免投产后给国家造成重大经济、政治上的? Preventive occupational health supervision is through the design review and acceptance of new, expanded and reconstructed projects, and the implementation of relevant health regulations, norms and standards in the design and construction process. Occupational health supervisors carry out effective supervision and management of harmful operations so as to eliminate or control harmful factors before the project is put into production and avoid causing major economic and political consequences to the country after putting into operation.