Abstract: Leopard moth(Zeuzara multistrigata)is a primary pest damaging the trunks of Casuarina equisetifelia along coastal regions of Fujian province. The biological characters of this insect are studied in this paper. Close relations are found between its occurence and ecological factors. Damage on tree trunks is heavy in forest, in which, there is an abundant sunlight or the shade density below 0.7. Forests over 7 years in age are almost undamaged by the insect. The damage is lighter in mixed forests than in pure ones. Soil improvement and basal fertilizer application can increase the defensive ability of trees to the insect. When there are rich ground vegetation and large amount of natural enemies, the rampancy of leopard moth can easily be controlled. Sanitation culting can also reduce the sources of the insect.