A method for configuring an absolute grant mapping relationship table for a drift radio network controller, comprises: a serving radio network controller informing the drift radio network controller of the absolute grant mapping relationship table used by an enhanced-dedicated channel absolute grant channel (E-AGCH) by signaling; and the drift radio network controller returning a response message to the serving radio network controller after storing the information configured. According to the present invention, an absolute grant mapping relationship table of which a Node B under the control of a drift radio network controller is informed by a serving radio network controller to use is consistent with an absolute grant mapping relationship table of which a user equipment is informed by the serving radio network controller via an air interface to use, which guarantees that absolute grant values corresponding to the Node B and the user equipment are obtained from the same absolute grant mapping relationship table, i.e. from the same table of relationships between absolute grant values and indexes, and the allocation and use of the power resource by them are consistent, so that efficient use of resources and security of the system are guaranteed.