A method, a system and a server for transferring session control right, relating to communication field, are provided in the present invention. The method includes: receiving a request for transferring session control right; negotiating about session transfer with a client of which the control right is to be taken over or a client which is to take over the control right based on the received request for transferring session control right; and transferring the session control right to the client which is to take over the control right after a successful negotiation. The server includes a request receiving module, a negotiating module and a control right transferring module. Therefore, session control right can be transferred between various clients, which facilitates user with a better control over session.