Abstract:Analysis on the quantity,time and spatial patterns of threet pests of Lepidoptera and their natural enemies were conducted with grey system analysis,ecological niche analysis and collective intention analysis of spatial framework in order to protect and use the natural enemies of spiders rationally. The three pests of Lepidoptera were Ectropis obliqua,Eterusia aedea and Homona coffearia. The synthetic ranking results indicated that the dominant natural enemies of Ectropis obliqua were in order of Theridion octomaculatum,Clubiona reichini,Erigonidium graminicolum,Xysticus ephippiatus and Neoscona theisi in order; the dominant natural enemies of Eterusia aedea were in order of Clubiona reichini,Xysticus ephippiatus,Theridion octomaculatum,Neoscona theisi and Misumenops tricuspidatus in order；the dominant natural enemies of Homona coffearia were in order of Misumenops tricuspidatus,Clubiona reichini,Xysticus ephippiatus,Neoscona theisi and Theridion octomaculatum in order.Gathering averages of the three pests and their natural enemies were less than two due to the environmental factors.