A remote radio unit, RRU, positioning method, comprising: sending, by a first RRU, a second reference signal to a second RRU in a guard period, GP, wherein the first RRU is a to-be-positioned RRU, and the second RRU is an RRU at a known location; receiving (304, 402), by the first RRU, a first reference signal from the second RRU; determining (305, 306, 403), by the first RRU, a first delay value based on the first reference signal; reporting, by the first RRU, the first delay value to an upper-layer network element; and performing, by the upper-layer network element, location resolving processing based on the first delay value, to obtain the location information of the first RRU; characterized in that before the receiving (304, 402), by the first RRU, the first reference signal from the second RRU, the method further comprises: calculating, by the second RRU, a second delay value based on the second reference signal, and adding, by the second RRU, the second delay value to the first reference signal; or calculating, by the second RRU, sequence detection strength and a second delay value based on the second reference signal, and selecting, by the second RRU, a cell in which the detection strength is greater than a threshold to send (304, 402) the first reference signal to the first RRU, wherein the first reference signal carries the second delay value. sending, by a first RRU, a second reference signal to a second RRU in a guard period, GP, wherein the first RRU is a to-be-positioned RRU, and the second RRU is an RRU at a known location; receiving (304, 402), by the first RRU, a first reference signal from the second RRU; determining (305, 306, 403), by the first RRU, a first delay value based on the first reference signal; reporting, by the first RRU, the first delay value to an upper-layer network element; and performing, by the upper-layer network element, location resolving processing based on the first delay value, to obtain the location information of the first RRU; characterized in that before the receiving (304, 402), by the first RRU, the first reference signal from the second RRU, the method further comprises: calculating, by the second RRU, a second delay value based on the second reference signal, and adding, by the second RRU, the second delay value to the first reference signal; or calculating, by the second RRU, sequence detection strength and a second delay value based on the second reference signal, and selecting, by the second RRU, a cell in which the detection strength is greater than a threshold to send (304, 402) the first reference signal to the first RRU, wherein the first reference signal carries the second delay value. calculating, by the second RRU, a second delay value based on the second reference signal, and adding, by the second RRU, the second delay value to the first reference signal; or calculating, by the second RRU, sequence detection strength and a second delay value based on the second reference signal, and selecting, by the second RRU, a cell in which the detection strength is greater than a threshold to send (304, 402) the first reference signal to the first RRU, wherein the first reference signal carries the second delay value.