NOVELTY - Preparing biological agents involves weighing 20-25 pts. wt. water, 8-10 pts. wt. polyethylene glycol, 7-8 pts. wt. humic acid, 5-7 pts. wt. sucrose, 3-4 pts. wt. kaolin, 2-3 pts. wt. ammonium sulfate, 2-3 pts. wt. chitin and 1-2 pts. wt. silica powder. The particle size of silica powder is 200 mesh. The humic acid is crushed, mixed with kaolin, and then crushed to obtain 100 mesh powder. The water, polyethylene glycol, sucrose, ammonium sulfate, chitin and silica powder are added to reactor, and stirred at 500 revolutions per minute for 3 minutes.    USE - Method for preparing biological agents for treating waste water containing threonine (claimed).    ADVANTAGE - The method enables to prepare biological agents having large surface area, and good water treating effect.    DETAILED DESCRIPTION - Preparing biological agents involves weighing 20-25 pts. wt. water, 8-10 pts. wt. polyethylene glycol, 7-8 pts. wt. humic acid, 5-7 pts. wt. sucrose, 3-4 pts. wt. kaolin, 2-3 pts. wt. ammonium sulfate, 2-3 pts. wt. chitin and 1-2 pts. wt. silica powder. The particle size of silica powder is 200 mesh. The humic acid is crushed, mixed with kaolin, and then crushed to obtain 100 mesh powder. The water, polyethylene glycol, sucrose, ammonium sulfate, chitin and silica powder are added to reactor, and stirred at 500 revolutions per minute for 3 minutes. The mixture is allowed to stand for 12 hours, then dried at 60 degrees C to obtain biological carrier with moisture content less than 5%. Bacillus subtilis, Lactobacillus acidophilus, Acinetobacter baumannii and Sphingomonas are cultured to a concentration 1pts. wt.asterisk107 cells/ml. Scenedesmus obliquus is cultured to a concentration of 1pts. wt.asterisk105 cells/ml. The Bacillus subtilis, Lactobacillus acidophilus, Acinetobacter baumannii, Sphingomonas and Scenedesmus obliquus are mixed in ratio 5:3:2:1:1. The mixture is allowed to stand for 6 hours to obtain mixed liquid. The obtained liquid is mixed with biological carrier in ratio 1:2, and fermented for 24-36 hours. The mixture is dried to obtain final product with 10% moisture content.