Abstract: To evaluate the survival and predation rate of the predatory bug Rhynocoris fuscipes against Spodoptera litura under high temperature stress, hatching rate of eggs, emergence rate of 5th nymphs, survival rate of different life stages of R. fuscipes were measured in the laboratory, after being subjected to high temperature stress at 30 ℃, 33 ℃, 36 ℃, 39 ℃ and 42 ℃ for 48 hours respectively. Daily prey consumption of different life stages of R. fuscipes on S. litura larvae at 30 ℃, 33 ℃, 36 ℃, and 39 ℃ respectively in 24 hours was recorded. The results showed that there was a significant effect of high temperature on survival, eclosion and egg hatching rate, also the prey consumption of R. fuscipes. The survival rate of female adults and 5th instar nymphs was 66.67% after 48 hours of high temperature stress at 42 ℃. Survival rate, egg hatching rate and eclosion rate increased with temperature from 27 ℃ to 33 ℃, and decreased gradually with the increase of temperature after 33 ℃. Survival rate, egg hatching rate, and eclosion rate all decreased significantly when the temperature exceeds 36 ℃. The predation efficiency of predation quantity decreases gradually with the increase of temperature in the range of 33-39 ℃. The predatory functional response type of different states of R. fuscipes to S. litura conforms to Holling II disc equations. The searching efficiency of R. fuscipes against S. litura larvae decreased with increasing prey density, and the predation amount and predation rate of R. fuscipes decreased gradually after the interference presented. The results showed that R. fuscipes has a certain tolerance to high temperature stress, and its suitable temperature range for survival is 33-36 ℃.