A method and apparatus for session management function reselection. A method performed by an access and mobility function includes selecting a second session management function (SMF) to serve a session of a user equipment (UE). The session of the UE is currently served by a first SMF and an access network. The method further includes sending a create session management context request comprising a reason of selecting the second SMF to serve the session of the UE to the second SMF. The reason indicates that the session of the UE is still served by the access network. The method further includes receiving a create session management context response comprising a session resource modify request from the second SMF. The session resource modify request includes access network tunnel information of the access network. The method further includes sending the session resource modify request to the access network.