Objective To study the effects of flouride on the biochemical indexes in the electrolysis aluminium workers. Methods The activity of excess superoxide dismutase(SOD),glutathione peroxidase(GSH Px),catalase(CAT),alkaline phosphatase(AKP) and the level of calcitonin(CT),parathyrid hormone(PTH),IgG,IgA,IgM,F - in serum and F - in urine were measured in fifty electrolysis aluminium workers and 50 controls. Results The levels of serum F - and urine F - in exposed group were (0.21±0.061)mg/L and (1.96±0.9...