Abstract：Based on a systematic investigation on Oligonychus Perditus and its predatory enemies in the Platycladus orientialis forest of Taishan Mountain. The temporal and spatial niche breadth of O. Perditus and its major predatory enemies were studied in this paper. The study showed that the spatial niche breadth of O. Perditus was 0.629 8, the temporal niche breadth was 0.418 2, the temporal and spatial niche breadth were very narrow (0.263 4). Among the dominant predatory enemies, Orius minutus (Linnaeus) had the widest spatial niche breadth(0.817 2), Anystis baccarum (Linnaeus) had the widest temporal niche breadth(0.711 5), Propylaea japonica (Thunberg) had the widest temporal and spatial niche breadth. The time ×space niches overlap of Stethorus punctillum Weise and O. Perditus was the greatest, Typhhlod romus soleiger Ptitichatd et Baker secondly(0.759 6), which implied that the above two species of predatory enemies had better follow effects on O. Perditus.