Abstract: This experiment was conducted to investigate the effects of fermented composite preparations of Cyperus esculentus meal and traditional Chinese medicine（FCEMH）, Cyperus esculentus meal（CEM）, and fermented Cyperus esculentus meal（FCEM） on growth performance,nutrient apparent digestibility, serum antioxidant and various biochemical indicators, semen quality and other indicators of small-tailed han sheep. Seventy-two healthy male sheep with similar age and weight were randomly divided into four groups, namely three experimental groups and one control group. The control group was fed with a basic diet, and the experimental group fed with the diet added1% FCEMH（1%FCEMH）, 3% CEM（3% CEM） and 3% FCEM（3% FCEM）, respectively. Each group had three replicates, with six sheep per replicate. The experimental period was 70 days, with a pre-experimental period of 5 days and a formal experimental period of 65 days. The results showed that compared with the control group, all the experimental groups significantly increased the final body weight（P＜0.05）. The 1% FCEMH group could effectively increase the average daily weight gain of sheep and reduce the feed to weight ratio（P＜0.05）. The 1% FCEMH group significantly increased the digestibility of dry matter, crude protein, and neutral detergent fiber in sheep（P＜0.05）. The serum IgM content of sheep in the 1% FCEMH group significantly increased（P＜0.05）, and the serum malondialdehyde showed a certain downward trend. The 1% FCEMH group showed a trend of increasing sheep semen volume, acrosomal integrity rate in semen and testosterone content in seminal plasma, and reducing sperm malformation rate. Adding fermented composite preparations of Cyperus esculentus meal and traditional Chinese medicine to sheep feed could improve weight gain, nutrient digestion, and reduce F/G, and to some extent, it was beneficial for improving antioxidant capacity, immune performance, and semen quality.