The present invention discloses a configuration method and system of cell public information. Wherein, the method includes that a wireless access network element sends cell public information to a part of or all the mobile terminals residing in the cell through paging messages, and indicates effectiveness parameter information of the cell public information to said part of or all the mobile terminals; said part of or all the mobile terminals receive the cell public information, and use the cell public information according to said effectiveness parameter information. Through the present invention, it is enabled that the access network element can dynamically configure cell public control information or public channel configuration according to the service requirement, which satisfies the service requirement in time, and improves the efficiency of wireless resource usage.