With characters of V belt and flat belts, V-Ribbed belt has soft and tough property as flat belt and tight and effective property as V belt. Transmission power so high that at the same condition its 30% higher than common V belts. With tight transmission system, at the same transmission power, its occupied space is 25% smaller than common V belt. Flat and soft belt is suitable not only for transmission of small pulley but also for high-speed transmission with speed of 40m/s, Besides its characteristics as slight vibration, few heat diverge and steady working. Anti-heat, anti-oil, anti-wearing out few elongation and long life