Under the guidanee of Chairman Mao’s revolutionary line, scientific activities on experimental cultivation of marine organisms have been widely and vigorously carried out along the coastal regions of China. The poor and lower-middle peasants of Changdao County, together with the researchers of the Bureau of Marine Fisheries,Changdao County and of the Institute of Marine Fisheries, Yantai District, have condueted a series of experiments on the artificial breeding and cultivation of the holothurian, Stichopus japonicus Selenka. In 1972-1975, using the artificial induction method of increasing temperature to stimulate sperm releasing and egg production, they have suceessfully obtained about 170,000 juvenile holothurians. Juveniles artificially reared in concrete ponds and fed with dried powder of various algae (Entermorpha, Sargassum thunbergii, Rhodomela confervoides, etc.) and with a locally known feed" '(a greenish brown mud scraped from the surface of rocks that is rich in diatoms and organic debris)reached sexual maturity within a period of two years. This paper gives a detailed account of the experiments conducted during the past four years.