Objects of research: Appraising of the species diversity and the variation according to space of Chrysomelidae in Nui Chua national park. Determining the food of Chrysomelidae and appraising the change of their food according to space. | Summary of biological doctoral thesis: Study on the diversity of leaf beetle (Chrysomelidae) and relationship with plant in environmental condition at Nui Chua national park, Ninh Thuan province, Vietnam by molecular biological tool