Abstract：Objective To learn the passive smoking exposure and hazard awareness among the residents aged 18 years and over in Zhengzhou,so as to provide evidence for tobacco control. Methods By multi-stage stratified and clustered sampling method,the residents aged 18 years and over in Zhengzhou were selected. From June to October in 2018,a questionnaire for risk factors of non-communicable diseases,designed by Chinese Center for Disease Control and Prevention,was used to collect their passive smoking exposure and hazard awareness and then analyzed. Results A total of 6 793 questionnaires were qualified in 6 809 questionnaires and the effective rate was 99.77%. Among 5 387 non-smokers,2 131 people were exposed to passive smoking,and the crude and standardized rate was 39.56% and 40.14%. The standardized rate of passive smoking exposure was higher in men than in women（42.44% vs. 38.67%,P<0.05）,in rural residents than in urban residents（43.90% vs. 36.62%,P<0.05）,and it decreased with the age increase（P<0.05）. The standardized rate of passive smoking exposure in family,indoor workplace and indoor public place was 30.99%,36.99% and 68.02%,respectively. The standardized awareness rate of “passive smoking exposure may lead to heart disease,lung disease in children and lung cancer in adults” was 56.63%,which was higher in urban rural residents than in rural residents（75.69% vs. 36.33%,P<0.05）. Conclusions The passive smoking exposure rate was high in Zhengzhou,especially in indoor public places. The awareness of the hazards of passive smoking exposure was scarce, especially in rural residents.