In order to design reliable wire ropes by investigating the deformation characteristics of wires helix, axial strain’s explicit expressions and radius’ expressions of wires helix were deduced in which wires were bearing axial load and just touching each other. Additionally, cross section curve of helix wire, contact radius, clearance angle, width and ratio in wires’ same layer were obtained. With application analysis, the results show that axial strains gradually rise from inside wire to outside with equal helical angle; all wires’ axial strain ascend along with wire helix angle going up, and reach to be equal finally; clearance characteristics varies slowly, but the error of approximate contact radius increases along the increase of layers which supports that the section of wire is ellipse. As for the same material wires and few layers, theoretical clearance characteristics of wires helix is close to constant while bearing axial load. Therefore, to make the design of multi-lay wire ropes or litter helical angle much more serviceable, it is suggested that the wires should be calculated by the theoretical values deduced herein.
