Abstract: The effect of the amount of copper to iron base anti friction sintered materials were studied. It was concluded that effect of copper contains tow sides. Eirst,it is strengthening element and can increase mechanical properties. Second,it is the main cause of formation of porosity. and decreases mechanical properties of matrix. However,porosity makes materials frictionizing under oil lubrification and has good anti friction property.5% copper was regarded as the best composition of iron based anti friction alloys. The negative effect on mechanical propertes, especially tensile strength of copper is lowered when phosphorus was added.