The present paper, dealing with the Genus Acasta collected by the Institute of Oceanology, Academia Sinica during 1950-1978, is the fifth part of a systematic study of the cirripedian fauna of Chinese waters. A total of fifteen species were identified. Three species are new and ten are reported for the fitst tim from the waters around Chinese coasts. The type materials of the new species are deposited in the Institute of Oceanology,Academia Sinica at Qingdao.