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Aviation warning balls should be installed on transmission lines that traverse the airport clearance area and airspace. However, the widespread installation of aviation warning balls may impact the flow field around the ground line, posing safety hazards to the stable operation of the transmission lines in the wind field. In this study, a three-dimensional flow field of the combined structure of the aviation warning ball and ground line, resembling a spherical-cylinder shape, was established using computational fluid dynamics(CFD)numerical simulation. This study investigates the influence of the aviation warning ball on the aerodynamic characteristics of the transmission lines at a Reynolds number of 10 000. The results show a significant impact of the warning ball on the aerodynamic characteristics of the surrounding ground line. Near the warning ball, the ground line segments experience pronounced negative wind pressure compared to the distant cylindrical sections, especially when the position angles of the cylindrical surface range from θ=60° to 90° and θ=270° to 300°. The presence of the warning ball significantly increases the average drag coefficient of the adjacent ground line, intensifying variations in both the drag coefficient and the lift coefficient. Its influence extends approximately 0.95 m around the warning ball. The warning ball interacts with the vortex of the nearby ground line during the shedding process, which leads to the irregular form of the ground line vortex shedding, and further affects the frequency of the vortex shedding and the Strouhal number. [ABSTRACT FROM AUTHOR]