A total of 1068 species from 71 families. 9 orders were recorded in Phia Oac-Phia Den Nature Reserve. Among them, 8 species: Cheirotonus battareli (Pouillaude, 1913), Cheirotonus jansoni (Jordan, 1 Odontolabis cuvera fallaciosus Boileau, 1901, Dorcus curvidens curvidens (Hope, 1840), Eupa gracilicomis (Arrow, 1908), Teinopalpus imperialis imperialis Hope, 1842, Troides helena cerberus C. & Felder, 1865, Troides aeacus aeacus C. & R. Felder, 1860 belong to Vietnam Red Data Book, Part I. Ani 2007, Vietnam Red List 2007, and 32 Decree (3212006/ND-CP). 3 species of butterflies (Lepid Papilionidae): Teinopalpus imperia/is imperialis Hope, 1842, Troides helena cerberus C. & R. Felder, 1 Troides aeacus aeacus C. & R. Felder, 1860 was recorded in CITES list 2011. 16 species: Chelidc . violaceimembris Gressitt & Rondon, 1970, Chloridolum scutellatum Gressitt, 1939, Ch/orophorus Ii, Gressitt & Rondon, 1970, Demonax leucoscutellatus Gahan, 1906, Perissus mimicus Gressitt & Ron 1970, Rosalia formosa (Saunders, 1839), Trachylophus acutulus Holzschuh, 2009, Xylotrechus magni (Fairmaire, 1888), Pseudoechthistatus obliquefasciatus Pic, 1917, Anoploderomorpha abstrusa Holzscll 1989, Pedostrangalia tric percentrata Holzschuh, 1991, Parastrangalia communis Holzschuh, 1993, DOl gracilicomis Benesh, 1950, Prismognathus davidis Deyrolle, 1878, Purana parvituberculata Kos & Gag 2000, Promachus indigenus Becker, 1925 are new records for Vietnam.