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Magnetic properties and magnetization processes of Co nanowire arrays with various packing densities are investigated by means of object-oriented micromagnetic framework (OOMMF) software package with finite difference micromagnetic simulations.The packing density of nanowires is changed with the diameter,number of nanowires and center-to-center spacing between the wires.The magnetization reversal mechanism and squareness of the hysteresis loops of the nanowire arrays are very sensitive to the packing density of nanowires.Clear steps and plateaux on the demagnetization are visible,which tus out that dipolar interactions among the wires have a significant influence on switching field.