Abstract: Seven species of predators of Corythucha ciliata (Say), which belongs to 5 families, were found in Hangzhou, in which Chrysoperla nipponensis (Okamoto), Chrysoperla carnea (Stephens) and Orius spp. were the most numerous and widely distributed species. The functional responses of C. nipponensis larvae on C. ciliata could be described with the Holling II equation, and the preying capacity of C. nipponensis larvae on C. ciliata nymphs or adults ranked as: the 3^rd instar larvae of C. nipponensis on C. ciliata nymphs > the 2^nd instar larvae of C. nipponensis on C. ciliata nymphs > the 3^rd instar larvae of C. nipponensis on C. ciliata adults. Their corresponding attack rates (α) and handling times (T\-h) were 1.0141, 0.5687, 0.3757 and 0.0075, 0.0121, 0.0267, respectively. The 3^rd instar larvae of C. nipponensis preferred nymphs over adults of C. ciliata. The searching rate of C. nipponensis larvae decreased with the increase of the prey density. At the same density of C. ciliata nymphs, the average predation capacity and predation rate of the 2^nd and 3^rd larvae of C. nipponensis decreased with the increase of its density. The relationship between predation ratio (E) and density (P) of the 2^nd and 3^rd larvae of C. nipponensis was E=0.3164 P^-0.4700 and E=0.3411 P^-0.4762, respectively. There was a scrambling competition among C. nipponensis larvae.