Abstract: The reversing longitudinal dike is widely applied to the mountainous waterway regulation works, and the circumfluence characteristics near the reversing longitudinal dike head have great influence on navigation flow conditions. In this paper, the circumfluence characteristics near the reversing longitudinal dike head are discussed with the adoption of a 2-D flow mathematical model； the circumfluence parameters, such as the length and width of circumfluence area and the flow velocity at the turning point, are obtained; and the relationships between the circumfluence parameters, the geometry parameters of the reversing longitudinal dike and the inlet flow conditions are established including the corresponding calculation formulas. The calculated results are applied to the regulation scheme design for the Zhuerqi shallow shoal in the Yangtze River. The navigation hindering characteristics and the formation causes of the Zhuerqi shallow shoal are discussed, and the regulation schemes are proposed. Analysis of the simulated regulation schemes shows that after implementation of the regulation works, the channel scales meet the design requirements, the increasing in flow velocity and hydraulic index are in line with the expected design targets, the flow pattern in the channel is good, and there are no navigation hindering flow such as the backflow, oblique flow and cross flow, which indicates that the calculation formulas for the circumfluence characteristic parameters developed in this paper can provide an effective technical support for the regulation scheme design in the future.