The mechanism of using ultrasound and air bubble to clean vegetable was analyzed and the vegetable cleaning tester was developed. The orthogonal test of vegetable cleaning was done in this tester and the optimum parameters of vegetable cleaning was discovered as follows: the ultrasonic power is 450 W, the air bubble's intensity is 25 (m~3/h) and the cleaning time is 4 min. The washer of vegetable was developed on the basis of the optimum parameters. When the washer was used to clean leaf vegetable, the prod...