Objective In order to investigate and evaluate the heating-ventilating-air conditioning (HVAC) systems in the public areas and therefore provide the support for the hygiene management. Methods According to Hygiene Criterion of HVAC System, 10 HVAC systems in 10 star grade hotels in Nanchang were selected and PM10 and the total count of aerobic bacterial in the air condition systems, the collected dust weight and the total count of aerobic bacterial in the dust in the inner surface of ventilation vessels, the legionella bacteria in cooling tower water were determined. Results The HVAC systems in the 10 hotels, 90.1% for the PM10 and 73.3% for the total count of aerobic bacterial in the air condition systems, 8.9% for the collected dust weight and 86.7% for the total count of aerobic bacterial in the dust in the inner surface of ventilation vessels were over the standard limits, the legionella bacteria were detected in two of the investigated HVAC systems cooling tower water. Conclusion The hygienic problems are existed in the ventilated systems in the air conditioners in the pubic places.The health supervision and monitoring must go on enhancing.