Abstract: The composition of dominant population of arthropods and temporal-spatial niche was analyzed in the paper. The results showed the dominant populations were Aphis gossypii, Bemisia tabaci, Tetranychus cinnabarinus, Adelphocoris spp. Singa pygmaea, Propylaea japonica, Pardosa T-insignita, Erigonidium graminicolum, Theridion octomaculatum, Nabis sinoferus, Orius similis and Paederus fuscipes. The temporal and spatial niche breadth value of Propylaea japonica was maximum, and the temporal niche overlap value of Theridion octomaculatum between dominant predatory enemies and Aphis gossypii was maximum and the spatial niche overlap of Pardosa T-insignita was maximum. The evaluated model of dominant predatory enemies to Aphis gossypii was constructed considering the number, temporal and spatial niche, predatory capacity of dominant predatory enemies at the same time, and based on model the control effect of Propylaea japonica was maximum, arriving at 19.82%.