High-entropy alloys（HEAs）,also called multi-component alloys（MCAs）are new type alloys that are formed by mixing（usually）five or more elements in equal or relatively large proportions.These alloys are currently in the focus of materials science and engineering,because they have potentially desirable properties.In addition,studies show that some HEAs have a significantly better strength-to-weight ratio,with a higher degree of fracture resistance,tensile strength,as well as resistance to corrosion and oxidation than conventional alloys.Designing of this type of material is one of the most important directions of developing modern materials science.Currently,the full range of new developed HEA materials and their possible properties are still rarely revealed.Obtaining such multicomponent alloys is a complex scientific and technological task,therefore,to obtain an alloy with certain properties,designing the right elements and their concentrations and predicting their reliable properties are of great critical.In this paper,the influence of aluminum concentration on the phase composition and properties（density,Young’s modulus,hardness,electrical conductivity,thermal conductivity and molar volumes）of Ni Cr Co Fe Mn Al high-entropy alloys heat treated at a temperature of 600°C is studied.The results are predicted using computer modeling of material properties.The simulation results show that the aluminum concentration has a significant effect on the phase composition of the material.With an increase in the concentration of aluminum,the content of the β-phase（Ni Al intermetallide）increases,and the content of a solid solution with a FCC lattice（Gamma phase）decreases.As the aluminum content in the material increases,the values of density and Young’s modulus decrease,and the electrical and thermal conductivity and molar volume increase with increasing aluminum concentration.The hardness of the material also changes as the aluminum concentration increases,in some cases the hardness values increase and in some cases decrease.