Species composition of the stonefly order Plecoptera was investigated in Phia Oac Nature Reserve, Nguyen Binh, Cao Bang province, Vietnam. In total, 16 species belonging to 12 genera and 4 families were found. Family Perlidae was the most diverse family with 10 species (71.5 percent). Among them, the reently described Neoperlops vietnamellus Cao & Bae newly recorded for the study area. Moreover, one rew record for the Vietnam fauna were discovered, viz., Kamimuria punctata Sivec & Stark.