One-year-old pot-planted of Salvia splends,Zebrina pendula and Chlorophytum comosum were studied to determine the change of morphology and physiological characteristics of three plant under the different formaldehyde treatment in a closed chamber.The results showed that:the SOD activity decreased firstly and then increased,decreased in the end;the soluble protein content decreased firstly and then increased;the membrane permeability,contents of MDA and soluble sugar keep increasing; chlorophyll content decr...