For regulating the crossing shoal of which the side bar is broad and surface elevation is high,under the prerequisite of satisfying the functions of floe contraction and sediment diversion,we may reduce the dike length by eliminating the dike’s root section to form a spur dike without root section.Studies on waterway regulation of Tongguan shoal in Xiangjiang river reveal that the scheme of adopting the spur dike without root section can achieve satisfatory regulation effect,but we shall pay attention to the stability of the near shore gap section and bank.