Abstract: This paper deals with Lithosiidae, one of the families of insect fauna at Jianfengling forest area in Hainan Island. Insect capture with moth-killing lamp in the four types of forest vegetation has been done 231 times in 1981-1983 and 44 species 20 genera of this family have been collected. Among them, 20 species have been found for the new records in Guangdong Province. The capturing quantities show that the populations of the insects of Lithosiidae are very small. There are many groups with small population and a few with large population. It is concluded from the species and quanutities of every forest vegetation type that most of the insect species of Lithosiidae are in the tropical mountain rain forest. This can be explained by the fact that there are many host plants such as moss and lichen in this habitat. The appearance poriods of the adults in the fourth quarter and least in the first quarter. Some 82.35% of the insects with previous record in distribution are distributed in Oriental Region.