Cinnamomum Zeylanicum has many therapeutic effects for example the increasing of sexual ability. In this investigation the effect of cinnamon extract in concentrations 10 and 20 mg/kg b.w. have been worked out on male reproductive physiology in mice. After injection hormonal changes (LH , FSH and testosterone) were investigated. The results showed singnificant increase (P< 0.05) in the concentration of LH, FSH and testosterone hormones. It is concluded that cinnamon extract is useful on male reproductive system.