Abstract: The Yanji basin in which Bosten Lake is Located has an annual Precipitation 50∼80 mm, but its evaporation is 1800∼2500 mm and the ratio of evaporation to precipitation is beyond 30. So the ecological environment is easily destroied. The Bosten Lake was a fresh water lake originally. The human activies (mainly agriculture) aggravated the salinization and the salidity increased from 0.38 g /l in 1958 to 1.440 g/1 in 1975.
The amount of flowing-in salt was more than the flowing-out salt during the 1960's. The lake water stage descreased gradually and the lake salidity inreased. It was not untill 1982 that the annual average flowing-out salt exceeded flowing-in salt by 14.95×10⁴ t. The lake salidity got to steady during this time.
This paper calculated the water-salt balance of Baster Lake by means of meteorological and hydrological materials of Yanji basin and obtained the processss of salt pollution of Bosten lake. Furthermore, it put forward a feasible management to control the salt pollution and to purify the water of Bosten Lake.