A network access method, characterized by comprising: initiating, by a User Equipment, UE, a Tracking Area Updating, TAU, procedure to a second-system network cell when the UE performs a reselection operation from a first-system network cell to the second-system network cell; selecting, by the UE, to access the first-system network cell when the TAU procedure fails and the number of initiation times of the TAU procedure reaches a threshold value; adding a first preset value to a value of a second counter which is started, wherein the second counter is arranged to record the number of times for which the number of initiation times of the TAU procedure reaches the threshold value; and after time of a product of the value of the second counter and a value of a second timer, performing, by the UE, the reselection operation from the first-system network cell to the second-system network cell again if a cell reselection operation condition is met; before the step of selecting, by the UE, to access the first-system network cell when the TAU procedure fails and the number of initiation times of the TAU procedure reaches the threshold value, further comprising: starting a first counter, wherein a value of the first counter is equal to the number of initiation times of the TAU procedure; starting a first timer when the TAU procedure fails and the value of the first counter is smaller than a threshold value; and re-initiating, by the UE, the TAU procedure if the first timer times out; adding a second preset value to the value of the first counter, and repeating the previous step. initiating, by a User Equipment, UE, a Tracking Area Updating, TAU, procedure to a second-system network cell when the UE performs a reselection operation from a first-system network cell to the second-system network cell; selecting, by the UE, to access the first-system network cell when the TAU procedure fails and the number of initiation times of the TAU procedure reaches a threshold value; adding a first preset value to a value of a second counter which is started, wherein the second counter is arranged to record the number of times for which the number of initiation times of the TAU procedure reaches the threshold value; and after time of a product of the value of the second counter and a value of a second timer, performing, by the UE, the reselection operation from the first-system network cell to the second-system network cell again if a cell reselection operation condition is met; before the step of selecting, by the UE, to access the first-system network cell when the TAU procedure fails and the number of initiation times of the TAU procedure reaches the threshold value, further comprising: starting a first counter, wherein a value of the first counter is equal to the number of initiation times of the TAU procedure; starting a first timer when the TAU procedure fails and the value of the first counter is smaller than a threshold value; and re-initiating, by the UE, the TAU procedure if the first timer times out; adding a second preset value to the value of the first counter, and repeating the previous step. starting a first counter, wherein a value of the first counter is equal to the number of initiation times of the TAU procedure; starting a first timer when the TAU procedure fails and the value of the first counter is smaller than a threshold value; and re-initiating, by the UE, the TAU procedure if the first timer times out; adding a second preset value to the value of the first counter, and repeating the previous step.