The present invention discloses a method for a drift radio network controller (DRNC) to report that the transmission interval is not supported, in which, the DRNC reports the information that the cell does not support enhanced-dedicated channel (E-DCH transmission interval to the service radio network controller (SRNC) through signaling when the DRNC detects that its administrative cell does not support E-DCH transmission interval. By reporting the information that the administrative cell of the DRNC does not support E-DCH 2 ms transmission interval to the SRNC by the DRNC, the present invention enables the SRNC to obtain the information and accordingly to take part in making decision of stopping a user equipment from using the E-DCH 2 ms transmission interval or deleting the cell link that does not support the E-DCH 2 ms transmission interval, thus ensures normal communication of the user equipment.