Abstract: The width of flood-crest travel for inverted siphon culvert is decisive factor for the project cost and safety to construct the inverted siphon culver cross project on the watercourse.With the present condition of inverted siphon culvert of Anyang river,this paper analyzes model experimental results of water level,velocity,main current and scouring-deposition in different width under different layout schemes.From the safety,the effect of the river regime and project cost,this paper finds out that the 165 m is reasonable and feasible for flood-crest travel in width.