Abstract: M. orientalis is a polyphagous pest. It is an important pest in the fruit orchards where many highly toxic pesticides was prohibited. Because of the nocturnal biological characteristics, the M. orientalis could not be controlled by spray contact pesticide. To effectively control the M. orientalis and reduce spraying chemical pesticides, the effect of T. aestivum on host selection behavior of M. orientalis was studied in door and field experiment by using Malus pumila, Pyrus spp., Prunus persica, Prunus species, Crataegus pinnatifida and T. aestivum as the materials. The results showed that the selection rate of different kinds of fruit branches was all ≥90% the selection rate of T. aestivum was <10% when the M. orientalis made selection among different kinds of fruit branches and T. aestivum; the selection rate of the mixture of different kinds of fruit branches and T. aestivum was significantly lower than single kind of fruit branches. When T. aestivum existed both in the two arms of the H shaped olfactometer, the selection behavior of M. orientalis was disturbed, there was no significant difference of the selection rate between the two arms and the highest no selection rate was 25%. In field experiments, the population of M. orientalis in Prunus species orchard, Pyrus spp. and Malus pumila orchards with intercropping nothing were 18.4, 17.6 and 18.9 per plant, the population of M. orientalis decreased significantly under wheat intercropping in orchard. When the distance of pear to wheat was 0.5 m and 2 m, the percent of injury Pyrus spp. leaves were 8% and 9%, respectively, there was no significant difference (P>0.05); when the distance was 6 m, the percent of injury Pyrus spp. leaves increased to 35%, which was significantly higher than the 0.5 m (P<0.05); when the distance was 8 m, the percent of injury Pyrus spp. leaves was 73%, which was 8 times higher than the 0.5 m (P<0.05). It was concluded that T. aestivum was not the host plant of M. orientalis, T. aestivum could disturb the locating host behavior of M. orientalis. There was an excellent avoidance control effect against M. orientalis in Prunus species orchard, Malus pumila and Pyrus spp. orchards intercropping T. aestivum. When the distance of Pyrus spp. to T. aestivum was no more than 2 m, the avoidance control effect against M. orientalis would be excellent.