Abstract:Cephalcia tianmua Maa is a forest insect pest injurious to leaves of Pinus massoniana Lamb It can cause defoliation on large areas when reproducing on a large scale It hasone generation during a year,and the paiod of feeding is more than one month It hiber-nates as prepupa in the soil and pupates and emerges in next spring .Natural enemies are significant factors for restricting its population increace