Morphological, phenological, and nutritional changes occur in plant as responses to herbivory attacks can affect the other herbivores. In order to understand the effects of gall-inducing insect, changes of plant characters due to parasitism of the stem gall wasp, Dryocosmus kuriphilus, in chestnut leaves, Castanea crenata, were investigated. The relationship between numbers of galls and leaves showed positive in May. Leaves emerged earlier on galled shoots in May showed higher in leaf number, however, these leaves rapidly dried up. From May to July, leaves emerged from galled shoots were toughness and thick. Galled leaves had more nutrition in May and June, but were no significant in water content, and this relationship was reversed in July. The number of aphid, Myzocallis kuricola, on galled leaf was significantly higher in May and June, but decreased at the end of July. Laboratory experiments showed that fecundity and bodyweight decreased rate of the aphid were higher in May and June when on the galled leaf. In contrast, the aphid performance decreased in July on galled leaf. Our findings indicated that leaf traits changed by gall initiation were responsible to the performance of aphid as the subsequent herbivore.