NOVELTY - Method for utilizing yeast slurry obtained in beer production process involves (a) degrading macromolecule content of yeast cells by using ultrasonic waves together with an acid-alkali method without damaging the cell wall structures by autocytolysis process to obtain a pale yellow (1-3)- beta -D-glucan, and (b) using extraction residues generated during (1-3)- beta -D-glucan production from yeast slurry as a culture medium of Bacillus subtilis to produce alpha -amylase.    USE - The method is useful for utilizing yeast slurry obtained in beer production process which is useful for preparing (1-3)- beta -D-glucan (claimed).    ADVANTAGE - The method reduces pollution to the environment.    DETAILED DESCRIPTION - Method for utilizing yeast slurry obtained in beer production process involves (a) degrading macromolecule content of yeast cells by using ultrasonic waves together with an acid-alkali method without damaging the cell wall structures by autocytolysis process to obtain a pale yellow (1-3)- beta -D-glucan, and (b) using extraction residues generated during (1-3)- beta -D-glucan production from yeast slurry as a culture medium of Bacillus subtilis to produce alpha -amylase. The (1-3)- beta -D-glucan is prepared using Saccharomyces cerevisiae by induced autolysis and sodium hypochlorite oxidation involves (a) adding 30 ml water to 10 g S.cerevisiae, applying a power of 150 W, and frequency of 42 kHz for 10-80 minutes, adding 500 ml sodium hydroxide solution at a concentration of 0.1 mol/l, adding sodium hypochlorite at a concentration of 0.65% to the mixture and processing the mixture at a temperature of 52 degrees C and pH value of 5.5 for 30 hours, (b) cooling the mixture to 40-50 degrees C, centrifuging the cooled mixture at 3000 rotations per minute (rpm) for 15 minutes to obtain a supernatant, adding 50 ml sodium hydroxide solution at a concentration of 0.75mol/l, heating the mixture at 100 degrees C for 15 minutes, and centrifuging the mixture at 3000 rpm for 15 minutes to obtain an insoluble material, (c)adding 50 ml acetic acid at a concentration of 0.5- mol/l to insoluble material, incubating the mixture at 100 degrees C for 3 hours, and stirring the mixture vigorously, and (d) adjusting pH value of the mixture to neutral using sodium hydroxide, removing supernatant by centrifugation, washing obtained insoluble material three times with distilled water, washing the insoluble material again with 30 ml absolute ethanol three times, finally dehydrating washed material twice with 10 ml anhydrous ether, air-drying the dehydrated material at 37 degrees C to obtain a white powder, extracting the powder at an extraction rate of 85.3% to obtain 90.6% (1-3)- beta -D-glucan.