The current study was carried out to study the effect of magnetic field, of 1 G intensity, on the male fertility parameters.This study was carried out in the laboratory of Biophysics, Facultyof Science, Cairo University.28 adult male albino rats were divided into four groups, 2 controlgroups and 2 groups exposed to 1 G MF for 21 consecutive days. Onegroup was scarified at the end of the 21 days to study the effect of MF onfertility parameters (group 1) and the other group (group 3) was kept for48 days after ending of exposure to MF to study the delayed effect ofEMF. Blood samples were collected at time of scarifying in tubes withoutanticoagulants for obtaining serum to be used for estimation oftestosterone level. Testes were carefully excised and weighted.Epididymis was removed and mixed with physiological saline thenhomogenized to obtain supernatant and was handled as the semenexactly. Enzymatic antioxidants (superoxide dismutase and catalase) andnon enzymatic antioxidants (vitamin C and vitamin E) werebiochemically measured in the semen samples. Testes were fixed inBouin’s solution for the histological and histochemical examination byPAS stain.The testes weight showed significant decrease in both groups 1 and3 than that of 2 and 4 respectively.Testosterone level was significantly higher in group 1 than that ofgroup 2, while no significant difference was noticed between group 3 and group 4.All parameters of semen picture (sperm count, motility, viability and normality) were significantly decreased in groups 1 and group 3 than that of group 2 and group 4 respect