We studied the functional response of Asynacta ambrostomae to the eggs of Ambrostoma quadriimopressum at 14 ℃,18 ℃,22 ℃,26 ℃ and 30 ℃,respectively. The parasitic ability of Asynacta ambrostomae enhanced with the increasing of temperature,and the functional response fitted well by Holling-II equation at 14 ℃-30 ℃. The rates of the successful attack and the maximum parasitic rose with the increase of temperature,and the maximum parasitic number were 55.88 and117.48 at 14 ℃ and 30 ℃,respectively.