| Biological characteristics and spatial distribution of Oligonychus ununguis was studied by field observation and laboratory rearing. The results showed as following: Totally 19～21 days was needed for the O. ununguis to complete its life circle at the temperature of 25±1℃, 4d～6d for egg, 2d～4d for protonymph, 6d～9d for nymph, 3d～6d for adult. Some methods of aggregated indices and Iwao's way(regressive relation by M*-X)and power law of Taylor were used to test the spatial distribution of O.ununguis.The results showed that the eggs of O.ununguis belong to the pattern of aggregative distribution, the larvae of O.ununguis was the pattern of aggregative or symmetrical distribution, the spatial distribution pattern of the nymph and adult of O.ununguis was aggregative distribution.The cause of their aggregation was tested by Blackith's method.Based on this distribution pattern,a suitable sampling model has been discussed.The model for determining the optimum theoretical sampling number model and the optimum sequential sampling model were proposed.Orius sauteri (Poppius) is one of the major natural enemy of O. ununguis. The biological characteristics to O.sauteri was studied in order to control O. ununguis well. Totally 20～33 days was needed for the O. sauteri to complete its life circle at the temperature of 25±1℃. 1d～3d for egg, 2d～4d for the 1st instar, 2d～4d for the 2nd instar, 2d～3d for the 3rd instar, 2d～3d for the 4th instar, 3d～4d for the 5th instar, 6d～19d for adult. Adults emerged at 6:00～10:00 am, and copulate soon after the emergence, Oviposition was on the 6th day after copulation. The peak of oviposition was on the 8th day after copulation. An adult could lay 42 eggs in its lifetime.
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