Aluminum alloys have got extreme industrial importance since 19th century until now. They enter into several light and heavy industries. aluminum is hardened by impurity due to industrial application. In this study, aluminumcupper alloys (with 0.5% Mg) were prepared, where cupper amount was added to aluminum in different percentages (2.5%,4%,4.5%) ,no overtaking degree of saturation 6% of the weight of cupper. After adding definite percentage of cupper to aluminum, the compounds are fusioned for complete blending, where cupper atoms diffuse into aluminum. Samples are infusioned by definite methods and circumstances. The prepared alloys were thermally treated during 8-30 hours for hardening. In this research we will concentrate on the influence of cupper content on hardening of aluminum and other basic conditions, which are needed to obtain higher hardness for aluminum alloys.