Adults of Chironomidae were collected at Soyang river sites in Chuncheon-si, Gangwon-do on 1 August and 14 September in 2008, and 1 May in 2009. A total of 794 adults were collected, consisting of 52 species, 23 genera, 4 subfamilies. Among them, 7 species were recorded in Korea for the first time, and 9 species were new to science. These 7 previously unrecorded and 9 new species are described with illustrations. Eight species still have not been identified. The subfamily Prodiamesinae and four genera: Demicryptochironomus, Parakiefferiella, Psectrocladius and Monodiamesa are the first record in Korea. Tanytarsus seohyoni n. sp. was the most dominant species, consisting of 24.6% of the total samples.