Based on the spherical fuzzy hierarchy method， this paper proposes a method for evaluating and selecting capacity increasing conductors for a 500 kV transmission line in central China， taking into account practical application scenarios. The evaluation indicators are based on the basic characteristics of the capacity increasing wire， and they are analyzed from four aspects： electrical performance， thermal performance， mechanical performance， and economy. The spherical fuzzy analytic hierarchy process is used to construct the hierarchical analysis system structure， and the influence of practical application scenarios is considered. The fuzzy analysis theory is applied to the comparison matrix construction process to establish a spherical fuzzy comparison matrix that meets the engineering requirements. The scoring is based on the spherical fuzzy scoring function. The case calculation results show that in areas with high transportation capacity demand， aluminium clad steel core heat-resistant aluminium alloy wire is superior to other wires. In the cross mountain scenarios， carbon fiber composite core soft aluminium stranded wire is superior to other wires.