The present invention discloses a method and system for cell update. The method comprises: a target home NodeB receiving cell update signaling sent by a User Equipment (UE); the target home NodeB sending signaling carrying cell update information to a Source Radio Network Controller (SRNC) through a home NodeB gateway and a core network, or sending the signaling carrying the cell update information to a source home NodeB through the home NodeB gateway; the target home NodeB receiving signaling carrying UE Context and returned by the SRNC or the source home NodeB; and the target home NodeB allocating corresponding radio resources to the UE and sending a cell update confirmation message to the UE. The system is used to implement the method for cell update. The method and system enables the UE to perform cell update without restriction.