The research findings of 2 families, 23 species and 231 individuals represented meagrely 8% of the total in Mongolia. It can be attributed to the short research period and limited research sites of the Orkhon river basin. An insect is one of the natural resources that are exposed to the threats by global climate change and environmental destruction by human beings. An insect is an index species that is the most sensitive to the environmental changes. Therefore, there is an urgent need to identify the systemic and comprehensive entomo fauna of Mongolia and provide basic data and information for future biological resources.