口罩是预防呼吸道暴露的重要防线，正确选择和佩戴口罩可以降低新型冠状病毒(2019 novel coronavirus，2019-nCoV)等呼吸道传播病原感染的风险。但是，口罩类型、防护等级、职业性质、工作环境和防护要求以及正确的佩戴方式均会影响防护效果。本文以国家标准、行业标准以及诊疗方案等资料为参照，针对不同职业人群对口罩的选择与佩戴的关键点展开论述，为不同人群正确使用口罩提供参考，降低各类人群的暴露风险，以利于疫情的控制。

Masks are important to prevent respiratory tract exposure. Correct selection and wearing of masks can reduce the risk of respiratory-borne viral infections such as 2019 novel coronavirus (2019-nCoV). The protection level of mask using will be affected by the types of mask, the face shape, the occupational nature of the crowd, the working environment and the correct wearing scheme based on the national standard, industry standard, diagnosis and treatment plan and other relevant data or research results, this paper discusses the key points of the selection and wearing of masks for different occupational groups, so as to provide reference for different groups to apply correct respiratory protective measures, and reduce the exposure risk of various groups and facilitate the control of epidemic situation.