The ecological niches of the insect pests and their natural enemies on apple leaves，including vertical，horizontal and temporal niches，were researched in the ecological management apple orchard in Muping District of Yantai City located in the east part of China.The vertical and temporal niche breadth had significant difference among the eight species of insect pests，but the horizontal niche breadth was high and showed no significant difference except two suckers，a leafhopper，Erythroneura sudra，and a phytophagous thrip，indicating that the resources were exploited differently in the vertical dimension of the canopy of apple tree and in the temporal sequences，but similarly in the horizontal dimension.The three-dimensional niche overlaps were calculated by using Cody’s summation α and used to classify the guilds of the insect pests and their natural enemies.The community of the insect pests was classified into four guilds，including“the guild of apple green aphid，Aphis citricola ”，“the guild of Lithocolletis ringoniella”，“the guild of spider mites”and“the guild of pests feeding on tender leaves”.The formation of pest guilds resulted from the life history，the feeding behaviors，the resources requirement of the insect pests and the developmental stages of the apple tree.The community of the natural enemies consisted of four guilds，including“the guild of aphidophagous natural enemies”，“the guild of obligatory predators of spider mites”，“the guild of parasitoids of Lithocolletis ringoniella” and “the guild of spiders”.The classification of guilds can help elucidate how the insect community organized and the pests and their natural enemies interacted.The spatial and the temporal niche overlaps obviously showed close sympatry in space and close synchrony in time between the insect pests and their natural enemies，indicating that the natural enemies could respond quickly to the occurrence of insect pests and then exerted suppressing effect on insect pests.The criteria of classifying guilds of the insect community on apple leaves and the competition of organisms from different guilds were also discussed.