[Objective] The aim was to study the effects of four feeding attractants(dimethyl-β-propiothetin,trimethylamine oxide,betaine,sodium-5’-inosinate)on feed intake,growth performance,body composition,digestive enzyme activities and serum indices of Hucho taimen with initial body weight 9.39±0.26 g.[Method] The Hucho taimen was raised in water flow system.There was one control group and four process group.Each diet was randomly assigned to triplicates of 50 fish for 56 days.During the experiment,the water temperature fluctuated from 9.3 ℃ to 14.2 ℃ and the dissolved oxygen was above 8.0 mg/L.[Result] The weight gain rate and specific growth rate increased significantly by adding 0.2% dimethyl-β-propiothetin,0.2% trimethylamine oxide,0.2%betaine,but there were no changes with 0.05% sodium-5’-inosinate supplementation(P>0.05).The body crude protein increased significantly by supplementing 0.2% dimethyl-β-propiothetin(P<0.05),and body crude lipid decreased significantly by adding 0.2% trimethylamine oxide and 0.2%betaine(P<0.05),but body composition had no changes by supplementing 0.05% sodium-5’-inosinate(P>0.05).The digestive enzyme activities increased significantly by adding 0.2% dimethyl-β-propiothetin and 0.2% trimethylamine oxide(P<0.05),and the lipase increased significantly by supplementing 0.2%betaine(P<0.05),but digestive enzyme activities had no changes supplemented 0.05% sodium-5’-inosinate(P>0.05).The serum total protein,albumin and globulin increased significantly added 0.2% dimethyl-β-propiothetin(P<0.05),and the high density lipoprotein content increased while cholesterol,triglyceride and low density lipoprotein decreased significantly added 0.2% trimethylamine oxide and 0.2%betaine(P<0.05),and serum complement 3 and complement 4 increased significantly supplemented 0.05% sodium-5’-inosinate(P<0.05).[Conclusion] The food intake,growth performance,body composition and digestive ability of taimen were improved supplemented with 0.2% dimethyl-β-propiothetin,0.2% trimethylamine oxide and 0.2%betaine,respectively(P<0.05),but not 0.05% sodium-5’-inosinate.The immunity of body was improved by adding 0.05% sodium-5’-inosinate. [Objective] The aim was to study the effects of four feeding attractants (dimethyl-β-propiothetin, trimethylamine oxide, betaine, sodium-5’-inosinate) on feed intake, growth performance, body composition, digestive enzyme activities and serum indices of Hucho taimen with initial body weight 9.39 ± 0.26 g. [Method] The Hucho taimen was raised in water flow system. There was one control group and four process group. Each diet was randomly assigned to triplicates of 50 fish for 56 days. the water temperature fluctuated from 9.3 ° C to 14.2 ° C and the dissolved oxygen was above 8.0 mg / L. [Result] The weight gain rate and specific growth rate increased significantly by adding 0.2% dimethyl-β-propiothetin, 0.2% trimethylamine oxide , 0.2% betaine, but there were no changes with 0.05% sodium-5’-inosinate supplementation (P> 0.05) .The body crude protein increased significantly by supplementing 0.2% lipid decreased significantly by adding 0.2% trimethylamine oxide and 0.2% betaine (P <0.05) but body composition had no changes by supplementing 0.05% sodium-5’-inosinate (P> 0.05) .The digestive enzyme activities increased significantly by adding 0.2% 0.2% trimethylamine oxide (P <0.05), and the lipase significantly significantly supplemented 0.2% betaine (P <0.05), but digestive enzyme activities had no added supplements 0.05% sodium-5’-inosinate total protein, albumin and globulin increased significantly 0.2% dimethyl-β-propiothetin (P <0.05), and the high density lipoprotein content increased while cholesterol, triglyceride and low density lipoprotein decreased significantly added 0.2% trimethylamine oxide and 0.2% betaine <0.05), and serum complement 3 and complement 4 increased significantly supplemented 0.05% sodium-5’-inosinate (P <0.05). [Conclusion] The food intake, growth performance, body composition and digestive ability of taimen were improved supplemented with 0.2 % dimethyl-β-pro piothetin, 0.2% trimethylamine oxide and 0.2% betaine, respectively (P <0.05), but not 0.05% sodium-5’-inosinate. The immunity of body was improved by adding 0.05% sodium-5’-inosinate.