Informing method, system and device of benchmark expected received power initial value

The invention discloses informing method, system and device for a benchmark expected received power initial value, used for informing a base station and a UE of a benchmark expected received power initial value in a CELL_FACH enhancement system. The informing method of a benchmark expected received power initial value comprises the following steps that a radio network controller RNC determines the benchmark expected received power initial value through the interferential value of upstream slots reported by a base station; the RNC informs the base station of the benchmark expected received power initial value through a public configuration message; and the RNC informs a user terminal of the benchmark expected received power initial value through a radio resource control RRC broadcast message.