The age and growth, food and feeding habits ixi different stages and the biology of reproduction of the whitefish in Tai Hu Lake has been studied in 1980-1981..Particularly the present statQ of whitefish in the fishery of Tai Hu Lake was empha-tically investigated. So far, the whitefish has been thought to be a voracious fish and harmful to the fishery resources of Tai Hu Lake. So that the population had been seriously damaged by overfishing. Consequently, accompanied with maladjustment the composition of fish in the lags gradually become small and trashy, most of the valuable fish diminished and the undesirable populations explosively developed. After analysing the prey-predator relationship between the lake anchovies (Coilia ectenes taihuenasis Yuan et Lin, and C. brachygnathus Krey. et Papp.) and the whitefish,the necessity for protecting and enhancizlg of the whitefish in Tai Hu Lake is propo-sed, and the dotails about the catehahle site, prohibitions on fishing season, fishing-ground and fishing gears, also the releasing of fingerlings to the lake and the protection of environment are all suggested.