The invention discloses a confirming method and system for the subdistrict residency of the user device. The method comprises the following steps: step S102, the radio network controller transmits the system broadcast message to each subdistrict; the system broadcast message is carried with the subdistrict type information; step 104, the user device confirms whether the subdistrict is the ordinary subdistrict or the multimedia broadcast and group broadcast service subdistrict; and step S106, residing the double-receiver terminal in the ordinary subdistrict according to the subdistrict type and residing the single receiver terminal in the multimedia broadcast and group broadcast service subdistrict. The invention can reside the user device with different ability in the different subdistrict to enhance the utility ratio for the network resource, so that the user device can effectively use the network resources.