Abstract: This paper describes the structure design project of rotating device sustained azimuth branch in some big antenna pedestal. In the structure design a giant steel wire rolls track bearing is used, which can stand radial load, axis load and tip torque at the same time. The paper tests bearing capacity of steel wire rolls track bearing, analyzes and calculates rigidity of principal structure. The principle of increasing progressively load, the principle of load action line coinciding with rotation shaft line and the principle of rigidity, put forward in roll extrustion running-in way of steel wire rolls track bearing are summary of engineering design and practical experience.