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The experiment was used fermentation bed technology to study the effect of fermentation bed on diarrhea rate, growth performance and blood physicochemical indexes of lambs in winter. Three batches of experiments were carried out in a row, and 30 hybrid ewes who had just given birth and gave birth to two lambs in each batch were randomly assigned to two closed houses with windows and the same building structure, one floor was transformed into a fermentation bed (experimental group), and the other was used as a control group. The lambs were fed in a single pen for 7 d and then transferred out. Each group was randomly divided into three pens, transferred to semi-open houses, and continued to be fed until weaning at 60 d. The results showed that on 1~7 d, the diarrhea rate of lambs in experimental group was significantly lower than that in control group (P<0.05). From birth to weaning, the diarrhea rate and mortality of lambs in experimental group were decreased by 2.49% and 2.95% compared with control group (P<0.05). On 7 d of experiment, the body height, body length and chest circumference of lambs in experimental group were increased by 1.71, 0.56, 0.66 cm compared with control group, respectively (P<0.05). On 8~30 d, the average daily gain of lambs in experimental group was increased by 22.59% compared with control group ( P<0.05). The average daily gain of experimental group was significantly higher than that of control group during the whole experiment period (1~60 d) (P<0.05). At 60 d of age, the body weight of lambs in experimental group was increased by 13.42% compared with control group ( P<0.05). The percentage of lymphocyte in whole blood of lambs in experimental group was significantly higher than that in control group (P<0.05), and the content of GLU, TP and GLB in serum were increased by 8.45%, 3.34% and 10.49% compared with control group, respectively (P<0.05). The study indicates that using a fermentation bed feeding mode within 7 d of birth can reduce the rate of diarrhea and mortality before weaning, and improve the apparent digestibility and blood physicochemical indicators of lambs. [ABSTRACT FROM AUTHOR]