The invention discloses a method for allocating a static IP address to a terminal, which is applied to an evolved packet system (EPS). The method comprises: the terminal sending indicating information for applying the static IP address to the EPS network side; and a mobility management entity at the EPS network side receiving the indicating information as the static IP address allocated to the terminal; the mobility management entity sending the acquired static IP address to the grouped data network gateway; the grouped data network gateway allocating the static IP address to the terminal. The embodiment of the invention also discloses a system and a device for allocating the static IP address to the terminal. The invention is used for solving the problem how to allocate the static IP address to the terminal in the EPS.