[Objectives]  To clarify the influence of exposure to high temperature on the biology and predatory behavior of the ladybug Menochilus sexmaculates. [Methods]  Ladybugs were exposed to 35 ℃ for 3, 6 and 9 h after which their development, survival, fecundity, morphological characteristics and predation on Aphis craccivora, were measured and compared. [Results]  The results revealed that, compared to ladybugs kept at 25 ℃, exposure to 35 ℃ decreased adult longevity, egg production, immature survival and hatching rate, but had no effect on body length or weight. Moreover, the predation capacity (a'/T_h) and search efficiency (S) of M. sexmaculates with respect to A. craccivora were higher at 35 ℃ than 25 ℃, in particular after 6 and 9 h at 35 ℃. [Conclusion]  High temperature appears to have an adverse impact on M. sexmaculates but also to some extent increases its capacity to prey on A. craccivora. These findings provide a scientific basis for using M. sexmaculates as a biological control and increases understanding of the effects of global-warming on the natural enemies of pest insects.