Although the applications of the braided wire rope in electric power grid construction projects are universal,researches of domestic and foreign scholars are less. Based on the ellipse hypothesis and the forming research of the anti-twist braided wire rope,the space expansion graph was obtained by using the four-arcs method in drawing ellipse. According to the expansion graph,the relational expression between the rope length,braiding angle and the arc length was described. Considering the influence of physical characteristic parameters,the deformation of wire ropes was analyzed. Moreover,the expressions related to tension and axial force of strands corresponding to arbitrary arc section were deduced to establish the mechanical model of wire rope under axial load. In addition,take braided wire rope YS8 × 19 as an example,the total tension and tensile stress in arbitrary cross-section of the wire rope were given to further study for the mechanical properties of the anti-twist braided wire rope. Finally,the result obtained by numerical simulation is that the equivalent stresses of topical rope strands corresponding to the larger curvatures of the ellipse are larger.