The present paper analyzed actualities and shortages of traditional comfortable air-conditioning system(ACS) in utilizing fresh air, airflow organise, air purge and maintenance to assure indoor environment healthy, and presented a valid ways to improve ACS. Elaborated that in order to assure indoor environment healthy, reasonable, effective use of fresh air, airflow organise, air purge and maintenance will be the key of change from comfortable ACS to healthy comfortable ACS.