Yakou hydro-junction in Hanjiang River is navigable river junction.The navigation problem should be properly dealt with during the construction period.We propose corresponding navigation scheme combined with phased construction scheme, adopt the narrow channel in the first construction period so as to avoid the adverse effects caused by the broken navigation, and use the established lock in the second period to realize the combination of temporary navigation and permanent building.In view of the navigable flow conditions during the construction period, we establish a two-dimensional hydrodynamic numerical model to calculate and analyze the flow pattern under various flow conditions.The results show that the navigable flow conditions of two construction periods satisfy the related requirements.