The invention discloses a method, a system and a node for maintaining continuous conversation during switching among different domains, belonging to the field of mobile communication. The method comprises the steps: establishing the conversation connection of a moving node and a communication node in a first moving domain; and realizing the conversation of the moving node and the communication node by using anchor point device address information stored in the first moving domain before switching when the moving node is switched into a second moving domain from the first moving domain. The system comprises the moving node and an information storage device, and the node comprises an acquisition module and a conversation module. When the moving node switches between the first moving domain and the second moving domain, the moving node uses the anchor point device address information stored before switching to ensure that the moving node maintains the continuous and uninterrupted conversation with the communication node during switching among different domains.