Objective To understand the basic sanitary conditions and health hazards of key public places in Ma’anshan city,in order to provide data and technical support for strengthening public places sanitation management and disease prevention. Methods According to the requirements of National Health Hazard Monitoring Program for Public Places,in accordance with GB/T 18204-2013 Public Places Hygienic Inspection Methods and GB/T 18883-2002 Indoor Air Quality Standards,6 types of public places in the main urban area of Ma'anshan City were sampled to monitor their relevant health hazards. Results In 2019,50 public places in the main urban area of Ma’anshan City were randomly selected,with a total of 5436 items monitored and 4565 items qualified,and the overall qualified rate was 83.66%.There was statistically significant in the overall qualified rate of different types of places (χ²=155.26,P<0.01).The qualified rates of air quality and microbiological indicators were 89.84% and 93.21%,respectively.In the water quality test,the residual chlorine in the bath water of public bathrooms exceeded the standard seriously (25.00%).8 kinds of main health hazards were monitored in public places,and the top three exceeding rate were 53.01% of towel pH,59.86% of PM_2.5 in the air and 61.83% of Legionella. Conclusion Health hazards in public places in the main urban area of Ma'anshan City in 2019 are well controlled,but it is still necessary to strengthen the monitoring of health hazards in public places including the sanitary supervision of public supplies and facilities,especially the prevention of Legionella in shower water and cooling water.