Current accelerated climatic warming is largely caused by emission of greenhouse gases into the atmosphere. Experimental warming can be an effective approach to directly test the effect of temperature elevation on ecological processes with less confounding factors. Within forests, most biological activities and species diversity are concentrated on the canopy of mature trees rather than in the understory. In this presentation, I report the result of a three-year experimental warming of mature oak trees (20m in height) using heating cables. For better understanding a mechanism how global warming affects plant-herbivore interactions at the canopy, field experiments were conducted to warm separately above- and blow-ground parts of mature oak trees (climax species). Furthermore, to determine different responses of other tree species (pioneer species) to global warming, I conduct experimental warming of mature birch trees. These experimental results showed that soil warming decreased canopy herbivory of oak trees but increased canopy herbivory of birch trees through changes in leaf traits. However, branch warming did not affects leaf traits and herbivory of both tree species. To predict the effect of global warming on plant-herbivore interactions, we should consider different responses of tree species with different strategies.