High Entropy Alloys (HEAs) as solid soluble alloys contain at least 5 main elements with an equal or nearly equal atomic ratio, which typically comprise elements are between 5 and 35% at in these alloys. Mainly, the type of microstructure and properties of the high entropy alloys depend on the type and amount of the forming elements, so that in these alloys a solid solution of FCC, BCC, or a combination of these two solutions can be obtained in order to achieve better strength and uniformity acquired. In this study, FeCrCoNiCu high entropy alloy powder was produced using mechanical alloying (MA) and different milling times (10, 20, 30, 40 and 50 hours). X-ray diffraction (XRD) results at this stage indicate that FCC and BCC phases are formed after 30 hours of milling. In order to determine the atomic percent of the elements and the chemical composition, X-ray diffraction analysis (EDS) and scanning electron microscopy (SEM) were used to study the microstructure and morphology of the FeCrCoNiCu alloy system. In order to investigate the thermal behavior, a differential thermal test (DSC) with a constant thermal temperature of 10 ? /min was made from the alloyed powder. In order to investigate the mechanical behavior of the FeCrCoNiCu alloy system, the alloy powder was compressed using spark plasma sputtering () and vacuum arc remelting (VAR), and their microstructure and mechanical properties were compared. The mechanical properties of the FeCrCoNiCu alloy system, produced by MA and VAR methods, were evaluated by hardness, microhardness and shear punching tests. The results show that the microhardness and hardness of the alloy produced by the MA method are more than the alloy produced by the VAR method. In contrast to the results of the shear punch test, the yield strength and tensile strength of the alloy were significantly higher in the VAR than the MA alloy. Also, scanning electron microscopy images show that the alloy produced by the MA method has two phases of FCC (main phase and Cu-rich phase) and the alloy manufactured by the VAR method with three phase FCC (main phase, Cu-rich phase and Cr-rich phase). Keywords : high entropy alloys, mechanical alloying, vacuum arc melting, mechanical properties, microstructure