A method for information interaction under small cell deployment, includes: a mobility management entity re-selecting a serving gateway for a user equipment; the mobility management entity sending an evolved radio access bearer (ERAB) modification message to a master evolved node B to which the user equipment accesses, wherein the ERAB modification message carries new ERAB transport information. The embodiments of the present document further disclose an evolved node B working as a master evolve node B under small cell deployment.