Abstract: Objective To discuss the hazardous effect of formaldehyde on spontaneous symptoms and pulmonary function among occupational exposure populat ion.Methods sixty five workers exposed to formaldehyde,and 70 non-exposed garment workers as control,were investigated in the study.Spontaneous symptoms and pulmonary function were applied in the study.Results A significant difference was found in the frequency of occurrence of symptoms such as achr ymation,snivel,triedness,failure of memory,bellyache and tussis between two groups.The pulmonary function result indicated that there was statistical differene compared with the control group.And the workers ventilative function were abnormal mainly because the small gas channel was abnormal,and dose-effect reponse existed.Conclusion Obstructive air way changes can be found in for maldehyde exposure population.The pulmonary funtion injury was more severe with the prolongation of service.And pulmonary function test may be used as a method for early detection to monitor the hazardous effect of formaldehyde exposure.