The increase of electromagnetic radiations in the environment cause to growing public concern on the effects of them on human being health. The main purposes of many studies have recently been on these topics. Here we aimed to evaluate possible effects of electromagnetic radiations on ultra-structure of sperm. A healthy normal Holstein race bovine was selected for study. A total seminal fluid of a normal ejaculation obtained from normal ejaculation was divided equally into two sample groups. First control group (C1) and experimental group which exposed to electromagnetic radiations (E). At the end of test the ultra-structures of the sperms in all specimens was studied using transmission electron microscopy. Ultra structural changes were observed in the experimental groups comparing to control group (C1). Our data suggest that, electromagnetic radiation have harmful effects on ultra-structure of bovine sperm and is a potential factor which can result in short term dysfunction of sperm in the various stages of fertilization. These effects may be observed later in life.