The soybean sprouts oral liquid is prepared by soybean sprouts rich in γ-amino butyric acid and flavone.Soybean sprout extraction process by ultrasonic was optimized through orthogonal tests on the basis of signal factor experiment.The result indicated that the optimal extracting conditions were: ultrasonic power, 540W; ultrasonic temperature, 65 ℃; extracting for 35 min, and the ratio of material to liquid 1∶30.The optimization of oral liquid formula was also carried out by orthogonal tests, and the optimum formula was: honey 2.5%, saccharose 8.0%, salt 0.1% and xanthan gum 1.5%.Under the above conditions, the oral liquid had a light yellow color, strong sprouts fragrance, delicious taste, good stability, and containing 0.58mg/mL γ-amino butyric acid and 0.36mg/mL total flavone.