Abstract: ObjectiveTo investigate the pollutional status of VOCs,HCHO,acteone and acetaldeyde in indoor air of newly-built,research the dynamic trend and the risk of indoor pollution.MethodsTo analyze the concentration of VOCs in indoor air by GC-MS/SIM and aldehyde ketones by HL PC.Results13 chemicals of VOCs were detected at outset using in 3 newly-built rooms,among which more than 90% was toluene,the highest level was 3 044μg/m³.The concentration of aldehyde ketones in indoor air showed diverse change;the highest concentration of HCHO went up to 230μg/m³ in August in classroom,and lowered to 60% after one year.The dynamic trend was detected that the concentration of HCHO dropped gradually follow along with the time;also the pollutional level of HCHO and room temperature revealed a positive correlation (r>0.6410,P<0.01,n=13).The concentration of acetone and acetaldehyde decreased from 669 and to 52 and 49μg/m³ respectively after one year.ConclusionThe pollution of VOCs and aldehyde ketones in indoor air is ubiquity in newlybuilt.HCHO drops spirally along with the time,and but with transitory rises in summer,acetone and acetaldehyde decreases wavily.After a month VOCs lowers to 1/10～1/20 of outset quickly.