Jiepai junction is located at the branch entrance of a tidal river on the lower reach of the Yangtze River,and it is close to the main river and keeps an open layout due to limited land conditions.The branch mouth flow is significantly affected by the asymmetric tidal flow of the main river,and the cross flow at the entrance area of the approach channel exceeds the required value on the flood tide diversion case. The results of the physical model tests show that extension of the channel wall could just move the cross flow’s position forward,but can’t reduce its value;bank expansion towards the branch center could provide a shelter for the entrance area of the approach channel,and thus weaken the cross flow,but this method is restricted by the land condition;a permeable navigation wall head would disperse the cross flow and improve the flow pattern significantly,length of the permeable section is determined by the cross flow dispersion effect,while length of the whole wall is determined by the longitudinal tidal flow condition at the berthing area.