Abstract: The paper aims to clarify salt tolerance of sugarbeet from germination to seedling stage. By hydroponics indoor, we studied the germination rate of sugarbeet seeds, seedlings’growth during the cotyledon stage and the stage of third- pair true leaves, and some physiological indexes changes under different concentrations of NaCl. The results showed that: under NaCl stress at germination stage, the germination rate of sugarbeet seed was 75% and 22% in low and high concentration (140, 280 mmol/L), respectively; with the increase of NaCl concentration, the germination time of sugarbeet seed gradually extended, and the germination rate decreased significantly; during the stage of cotyledon and third-pair true leaves, salt stress could not cause plant death; the biomass of root, leaf, petiole and the whole plant, leaf area and chlorophyll content were significantly lower than those of CK, so the damage rate increased at the cotyledon stage; only biomass and leaf area reduced under high concentration of NaCl at the stage of the third-pair true leaves. Therefore, the effect ofNaCl stress on sugarbeet at germination stage was the biggest, followed by that at the cotyledon stage, while the smallest was that at third-pair true leaves stage.