The present invention discloses a method and system for triggering OI report. The method includes: a first terminal performing area division for its own coverage area to obtain layers of the coverage area of the first terminal; the first terminal determining a layer, in which a second terminal is located, of the coverage area of the first terminal according to maximum inter-cell interference intensity suffered by the second terminal currently; the first terminal computing PRBs needing to be computed according to status information of the interference suffered by the PRBs occupied by the second terminal, and setting a triggering threshold of the OI report used by the second terminal in the layer; and the first terminal triggering the OI report used by the second terminal when determining that the result of computing the PRBs is larger than the triggering threshold of the IO report.