The embodiment of the invention provides a network coverage method, a base station, a network accessing method, and a base station; the network coverage method comprises the following steps: when performing network coverage, on the basis that a continuously covered first layer of network is established by using a differ-frequency networking scheme, and establishing a discontinuously covered second layer of same-frequency network by using frequency band which is different from each frequency band of the first layer of network, thereby improving the communication property of users at cell edge and meanwhile giving consideration to the handling capacity of whole network. The embodiment of the invention further provides a scheme for accessing the network which is formed by the above network coverage scheme.