A method for selecting a working remote radio unit, RRU, for a user equipment, comprising: sorting, by a base station, measurement information values of all RRUs in a cell for a user equipment, and determining an initial RRU set as the current RRU set of the user equipment; calculating, by the base station, an isolation of the current RRU set of the user equipment by starting from calculating an isolation between the initial RRU set and a RRU in the cell outside the initial RRU set, according to the measurement information values in the sorted sequence; and determining, by the base station according to whether the isolation of the current RRU set of the user equipment satisfies a preset isolation threshold, whether RRUs corresponding to the measurement information values in the sorted sequence are working RRUs of the user equipment; wherein the isolation refers to a difference between an equivalent measurement value obtained by converting a combined value of measurement information values of RRUs in the current RRU set of the user equipment and an equivalent measurement value obtained by converting a combined value of measurement information values of RRUs outside the current RRU set of the user equipment; wherein the measurement information value is a reference signal receiving power RSRP; and a method for calculating the isolation is expressed as: g = 10 log ∑ k = 0 m 10 RSR P k 10 − 10 log ∑ k = m + 1 N − 1 10 RSR P k 10 = 10 log ∑ k = 0 m 10 RSR P k 10 ∑ k = m + 1 N − 1 10 RSR P k 10, wherein g is the isolation of the current RRU set of the user equipment; N is the number of all the RRUs in the cell; k is a number of an RRU in the sorted sequence; RSRP k is an RSRP value of an RRU numbered with k; and the current RRU set of the user equipment is the first m +1 RRUs in the sorted sequence. sorting, by a base station, measurement information values of all RRUs in a cell for a user equipment, and determining an initial RRU set as the current RRU set of the user equipment; calculating, by the base station, an isolation of the current RRU set of the user equipment by starting from calculating an isolation between the initial RRU set and a RRU in the cell outside the initial RRU set, according to the measurement information values in the sorted sequence; and determining, by the base station according to whether the isolation of the current RRU set of the user equipment satisfies a preset isolation threshold, whether RRUs corresponding to the measurement information values in the sorted sequence are working RRUs of the user equipment; wherein the isolation refers to a difference between an equivalent measurement value obtained by converting a combined value of measurement information values of RRUs in the current RRU set of the user equipment and an equivalent measurement value obtained by converting a combined value of measurement information values of RRUs outside the current RRU set of the user equipment; wherein the measurement information value is a reference signal receiving power RSRP; and a method for calculating the isolation is expressed as: g = 10 log ∑ k = 0 m 10 RSR P k 10 − 10 log ∑ k = m + 1 N − 1 10 RSR P k 10 = 10 log ∑ k = 0 m 10 RSR P k 10 ∑ k = m + 1 N − 1 10 RSR P k 10, wherein g is the isolation of the current RRU set of the user equipment; N is the number of all the RRUs in the cell; k is a number of an RRU in the sorted sequence; RSRP k is an RSRP value of an RRU numbered with k; and the current RRU set of the user equipment is the first m +1 RRUs in the sorted sequence.