Nitrogen(N) fertilization is known to affect indirectly herbivore insects on canopy regions on mature trees by altering deposition-induced changes in canopy leaf traits. But, few studies have investigated the consequences of the relationship between N fertilization in larger scale and herbivore insects. Here, we tested the hypotheses that N deposition in soil should affect canopy leaf traits and changed leaf traits should positively affect the herbivore insects. We investigated not only the responses of oak, white birch and alder to evaluate the relative response with plant function groups, but also, herbivore insects both before and after nitrogen fertilization(100 N kg/ha/year). Simulated N deposition caused a decreased C/N in oak and white birch, decreased total phenolic in white birch and cellulose in oak. Also, the herbivore consumption rates in oak and white birch were influenced. Redundancy analysis (RDA) ordination was not correlated with factors in leaf traits. Our results suggested that N fertilization affected leaf traits, particularly C/N, and herbivore consumption rates by chewer were also impacted in oak and white birch, but herbivore communities did not lead to response to fertilization in terms of enhanced leaf traits in this manipulation one-year.