A cell selection method in a wireless network, wherein the method comprises: determining, by a base station of the wireless network, available uplink and downlink capacities of each cell in multiple cells covered by the base station; determining, by the base station, available uplink and downlink capacities of a backhaul link of the base station; determining, by the base station, an uplink offset and a downlink offset of each cell, wherein the uplink offset is determined according to the available uplink capacities of each cell and available uplink capacities of the backhaul link of the base station, and the downlink offset is determined according to the available downlink capacities of each cell and the available downlink capacities of the backhaul link of the base station; determining, by the base station, an uplink path loss of user equipment, UE; and sending, by the base station, a message to the UE, wherein the message carries the uplink path loss of the UE, the uplink offset, and the downlink offset, so as to enable the UE to use the uplink path loss, the uplink offset, and the downlink offset to perform cell selection; wherein the determining available uplink and downlink capacities of each cell in multiple cells covered by a base station is specifically: performing grid division on each cell; determining a maximum capacity of each cell according to a system bandwidth, a service volume of each grid, and a signal-to-noise ratio of a reference signal of each grid by using formula: Capacity c, DL max = W ∑ p ∈ c T p ∑ p ∈ c T p log 2 − 1 1 + γ p RS, wherein W is a system bandwidth, T p is a service volume of grid p, and γ p RS is a signal-to-noise ratio of a reference signal of the grid p; obtaining uplink and downlink throughputs of each cell; and determining the available uplink and downlink capacities of each cell, wherein the available uplink capacity of each cell is a difference obtained by subtracting the uplink throughput from the maximum capacity of each cell, and the available downlink capacity of each cell is a difference obtained by subtracting the downlink throughput from the maximum capacity of each cell. determining, by a base station of the wireless network, available uplink and downlink capacities of each cell in multiple cells covered by the base station; determining, by the base station, available uplink and downlink capacities of a backhaul link of the base station; determining, by the base station, an uplink offset and a downlink offset of each cell, wherein the uplink offset is determined according to the available uplink capacities of each cell and available uplink capacities of the backhaul link of the base station, and the downlink offset is determined according to the available downlink capacities of each cell and the available downlink capacities of the backhaul link of the base station; determining, by the base station, an uplink path loss of user equipment, UE; and sending, by the base station, a message to the UE, wherein the message carries the uplink path loss of the UE, the uplink offset, and the downlink offset, so as to enable the UE to use the uplink path loss, the uplink offset, and the downlink offset to perform cell selection; wherein the determining available uplink and downlink capacities of each cell in multiple cells covered by a base station is specifically: performing grid division on each cell; determining a maximum capacity of each cell according to a system bandwidth, a service volume of each grid, and a signal-to-noise ratio of a reference signal of each grid by using formula: Capacity c, DL max = W ∑ p ∈ c T p ∑ p ∈ c T p log 2 − 1 1 + γ p RS, performing grid division on each cell; determining a maximum capacity of each cell according to a system bandwidth, a service volume of each grid, and a signal-to-noise ratio of a reference signal of each grid by using formula: Capacity c, DL max = W ∑ p ∈ c T p ∑ p ∈ c T p log 2 − 1 1 + γ p RS, wherein W is a system bandwidth, T p is a service volume of grid p, and γ p RS is a signal-to-noise ratio of a reference signal of the grid p; obtaining uplink and downlink throughputs of each cell; and determining the available uplink and downlink capacities of each cell, wherein the available uplink capacity of each cell is a difference obtained by subtracting the uplink throughput from the maximum capacity of each cell, and the available downlink capacity of each cell is a difference obtained by subtracting the downlink throughput from the maximum capacity of each cell.