Electro less deposition is an autocatalytic chemical technique to deposit a coating of metal on a work piece with the presence of a reducing agent. Electro less nickel coating has high advantages in electroplating. In this work the changing structure of nickel deposits on aluminum and its alloys at the early stage of electro less nickel deposition using sodium hypophosphite ion used as reducing agent which has been studied. The behavior of nickel coating on tensile behaviour of aluminium is investigated using experimental and as well as numerical methods .In this case FEM software ANSYS 14.0 is used for the numerical analysis for compare to experimental investigations. The experimental investigations were also validated by numerical analysis.