The navigable channel selection is the key of channel regulation, because it determines the waterway regulation project layout, which is crucial to the success of the project. The navigable channel selection is more complicated than channel line selection of single-channel reach. On the basis of the alluvial process analysis and the characteristics of navigation-obstruction of Daijiazhou reach in the middle Yangtze River, the shortcoming and merit of two channels of braided reach are investigated respectively. The selection of navigable channel is discussed.The navigable channel is proposed.