Abstract: The China Fir Cunninghamia lanceolata(Lamb.)Hook is a forest tree of economic importance for reforestation in China.In recent years,it had been discovered from Zhejiang province that the larvae of a pyralid insect pest identified as Euzophera batangensis Caradja bore into and devoure the cambium under bark causing damage to large numbers of trees of 3—10 years old.The present papee brings the results of investigations of bionomics of this insect pest carried out during 1983—1984 at Suichong county of Zhejiang province.It was found that this insect pest has 4 generations a year and overwinters in larval stage.The bionomics and control measures are described in detail.Testing of insecticide of 40% Dimethoate spread on barks is suggested as effective for its control.