棉铃虫多胚跳小蜂是棉铃虫的一种寄生性天敌。该蜂一年1代，以幼虫在土内越复越冬（在棉铃虫幼虫体内），当5月份棉铃虫在麦田产卵时，该峰也同时羽化，并在棉铃虫卵内产卵寄生，当棉铃虫幼虫老熟入土后，该蜂突然行多胚生殖，一个棉铃虫幼虫体内有峰高达800～900头，棉铃虫则很快死亡。本文对该蜂的昼夜活动，田间消长、交配和产卵行为等都作了报道。 Helicoverpa armigera multi-embryo is a parasitoids of cotton bollworm. The bee a generation a year, the larva more in the soil overwinter (in the body of the cotton bollworm larvae), when cotton bollworm spawning in the wheat field in May, the peak also eclosion and egg spawning in the cotton bollworm parasites, When the cotton bollworm larvae mature cooked into the soil, the bee suddenly polycystic embryo reproduction, a cotton bollworm larvae peak as high as 800 ~ 900, bollworm died soon. In this paper, the bee’s day and night activities, field growth and decline, mating and spawning behavior were reported.