(Dybowski) belongs to Cypriniformes, Cyprinidae and which is an especially economic fish. The mature fish migrate into freshwater river of the Suifen River and the Tumen River, from Japan Sea for spawning. Recent years, the spawning environment of has been changed because of decreased vegetation fraction, accelerated soil erosion and increased river turbidity. Besides, poaching and heavy fishing in spawning season further caused sharp reduce of the number of spawning group year by year. So, it is urgent to protect this precious fish. However, studies on mainly focused on artificial propagation, reproductive group structure, embryo, population genetic relationship and so on. The effect of water ecological factors on this fish has not been reported yet. In order to understand adaptability of this fish to salinity and carbonate-alkalinity, the toxicity of these two ecological factors in water to was studied. Acute toxicity was determined under water temperatures ranging from 22 to 25 by one-way toxicity test. The results showed that when alkalinity was 1.11 mmol/L with pH 7.3±0.2, the LC₅₀s of NaCl concentration towere , and 12 h, 24 h, 48 h and 96 h, respectively. And the safe NaCl concentration was 8.52. At pH 8.5±0.5 with NaCl concentration of 3.1−7.4g/L, the LC₅₀s of carbonate-alkalinity to were mmol/L