CO2 and PM10 in military barracks were studied using DustMate, Mini Vol. Air Sampler and DirectSenseTM PPC TG-502 Monitoring Kits in 2010. The distributions of CO2 and PM10 in the military base were strongly affected by soldier\'s behaviors as well as managements for the barracks. Before this study, the military site may fail to follow \"IAQ Administration Law of Multiplex Utilization Facilities, ect.\" in terms of CO2 and PM10. After adopting advanced cleaning methods and ventilation system, the concentrations of CO2 and PM10 were maintained under the regulation, respectively. The distribution of CO2 was related to the number and time of ventilation. In contrast, PM10 was dependant on the soldiers\' indoor-activities rather than ventilation. This study supported that management and education for barracks and soldiers plays in a role to control indoor quality of military facility. Keywords : CO2, PM10, Soldiers\' behaviors, Barracks