Ningbo Metro, with the main urban area as the core, is guided by the idea of crossing three rivers (Yaojiang River, Yongjiang River, Fenghua River), connecting three areas (Sanjiang area, Zhenhai area, Beilun area), and along three axes (commercial axis, water axis, public construction axis) to form the framework. The radiation range covers the entire Ningbo urban area, Yuci area and Fenghua group. The planned line network is 247.5km long (177.4km in the main urban area, excluding urban lines). Ningbo's rail transit consists of 10 radial lines connected into a network. Among them, there are tentatively 7 urban lines and 3 urban lines.