The “Outline of Transportation Power” and “Guiding Opinions on Cultivating and Developing a Modern Metropolis” have been issued. Four Network Convergence has become an important measure for promoting the integrated development of metropolitan areas. This article tentatively summarizes the connotative functions and implementation path of the Four Network Convergence, including arterial railways, intercity railways, suburb railways, and urban rail transit. As a typical representative of the development of a metropolitan area, Qingdao metropolis has a large-scale and multi-barrier space as well as typical circularization and flattening characteristics. With the aim of building the Qingdao metropolitan area along the construction track with a circular layered layout and different configurations, the creation of a rail transit compound ring bay channel and a multi-level hub system has been proposed herein. This will eliminate the disadvantages of the terminal hub layout and promote the coupling of rail transit and urban centers, forming the network structure of the Qingdao metropolitan area based on rail transit.