Keluke Lake, located in tha hinterland of Qinghai--Xizang(Tibet)Plateau (2, 800m above the sea level)，is the only freshwater body of the Qinghai Province. The lake water has very low of salinity (0.78%)and abundant in aquatic plants, zooplankton and zoobenthos, but only two species of local fishes, i. e.Gymnocypris and Nemachilus inhabit in the lake. However, the average water temperature is rather low (in May to September often below 18℃).Since 1973, many species of freshwater fish introduced into the lake, inclu-ding common carp, crucian tarp, silver carp, big head, grass carp, black carp and blunt-snout bream, in which common carp and crueian carp grow well and reached to sexual maturation in the Iahe, and. grass carp and blunt-snout bream grow well but not yet matured, but silver carp, big head and black carp seem, hard to be dome-stieated. For further exploitation of biological resources, an appropriate fish composition would be of great significance to increase the productivity of the Take and to establish a management and fishing organization far introduction and domestica-tion of suitable species.