Along with a growing concern on indoor air quality,it becomes more and more important to take a control and treat on indoor air pollutants,such as formaldehyde,total volatile organic compounds TVOCs,microbial,and particulate matter.To this end,our innovative group used corona discharge plasma together with photo-catalytic to treat formaldehyde.The modified photo catalysts were loaded on the electrode surface,and thus treating formaldehyde in an artificial enclosed room.To explore the relative purification factors of plasma cooperated with photo-catalytic and their relationships,the catalyst quantity,inlet rate,temperature,humidity and other process variables were changed during experiments.