Abstract: The life cycle of orb-weaver spider, Araneus ventricosus( Arachnida: Araneae,Araneidae) takes for two years stretching over three years in Jilin province, China. The spider overwinters in the first to second and the six to seven instars. Except for the egg stage and the first to second instars, the other young instars and the mature spiders spin webs so they can catch insects and other small animals for their food. The spider favorites light place in the habitat, and spin vertical circular nets in the forest edge, forest gap, roadside, resting in the daytime and feeding in the night. Even in the light rain condition they are active normally. The spider can prey directly small insects, however, for large insect they can feed it after web capture silk is twined. The spider feed many larch insect pests, including the moths of Coleophora obducta (Meyrick), Dendrolimus superans (Butler), Malacosoma neustria testacea Motschulsky, Lymantria dispar L., Lymantria mathura Moore, Laspeyresia grunertiana (Ratzburg), Laspeyresia zebeana (Ratzeburg), and the sawflies of Pachynematus itoi Okutani, Pristiphora erichsonii (Hartig). Thus, the spider potentially becomes an effective natural enemy of larch insect pests.