To overcome shortcomings of gingko hulling process of roller-crush board huller, low hulled rate, difficulty of crushed mixture, etc, structure of the huller was redesigned. The crush board was improved, two shocking board were put into the crushing facility, and crushed mixture of gingko were separated with wind raising sieve. After 4-factor-2-level orthogonal experiments had been accomplished, key parameter of the hushing equipment had been studied with the quantitative analysis. The result shows that, the cracked nut rate T increases by 9% over before, and can reach 70%. The smashed nut rate S is less than 12%, the rate of remained core in shell dropped to 10% and the rate of remained shell in core go to 8%, while the four key parameters (roller material, rolling interstice, rotate velocity and pre-treating) were adjusted to 45# steel, 10 mm, 1000 r/min and 4 hour under 50℃ infrared drying oven, respectively. A second generation of improved prototype of gingko huller would be implemented based on the experiments.