Background: Metformin is anti-hyperglycemic effect due to decrease of hepatic glucose production. Another effect, leading decrease insulin resistance, regarded a safe drug, treatment of choice for overweight. Objective: To investigate the effects of 3 concentration of MF administered orally to male mice on sperm parameters as model for human being. Materials and Methods: In current study, 80 male mice were taken with age ranging between 1.5-2 month and weights ranging between 25-30 grams males classified into four groups of a control group (G1) and treated group (G2, G3 and G4) doses of MF were employed, 0.2, 0.4, 0.6 mg/mice daily to groups, given orally for 6 weeks and then the animals were scarified. Results Results have revealed a significant difference (P < 0.05) in sperm concentration for 3 groups compared to G1 group. Progressive motility (%) appeared with significant difference (P< 0.05) for G3 group as compared to other treated and G1 group. Furthermore, the result illustrated a significant decreased (P< 0.05) in the abnormal sperm morphology for G3 group compared with treated and control. However, sperm agglutination (%) confirmed that the G3 group exhibited highly statistical significant decrease (p≤0.001) compared to G1, G2 and G4. Conclusions From results of the present study, it was concluded that the administration of MF doses reduce sperm concentration .while, 0.4mg dose improve certain sperm parameters.