The Jili junction of the southern branch of Ganjiang River is located in the channel with an S-shaped sharp bend and complex river regime topography，and thus the flow conditions in the entrance area of the approach channel and the connecting section are poor. Therefore，this paper studies its navigable flow conditions by the overall hydraulic physical model of 1：100. The results reveal that 1）the upstream flow conditions of the junction are complicated. The requirement of maintaining the lateral flow velocity within 0.3 m/s can be met by engineering measures including adjusting the intersection angle between the upstream route and the main flow to 31.08°，regulating the elevation of the sub-embankment on the beach to 17 m，retreating the earth embankment by 30 m，and joining the embankment. 2）In the downstream entrance area and the connecting section of the junction，the downstream beach cutting angle can be adjusted to 10° to make each flow velocity indicator satisfy the requirements of the code.