Functional response and searching rate of the Orius sauteri adult to Frankliniella occidentalis adults were studied in order to learn the control efficiency of the O. sauteri to F. occidentalis. The results showed that the functional response could be described by Holling II at all tested temperatures. At the same temperature, predation capacity of O. sauteri adult to F. occidentalis adults increased with the increment of density of F. occidentalis adults, however searching rate decreased. Predation capacity of O. sauteri adult increased with the increment of temperature at 18~26℃, however decreased at 26-34℃. At the same prey density, the average predation capacity and predation ratio of O. sauteri adult decreased with the increment of its density. The relationship between predation ratio (E) and density of O. sauteri adults (P) was described by equation of E=0.5224 P^-0.7148, and the relationship between intensity of scrambling competition (I) and the density of O. sauteri adults (P) was I =0.9689logP + 0.0763.