In order to study the flexible rubbing mechanism and cracking performance of Chinese chestnut, the cracking experimental research which was for a certain size was done, using a flexible rubbing device based on flexible rubbing mechanism. The single factor test was about the effects of speed and space on cracking rate and crushing rate. The results indicate that Chinese chestnut cracking rate and crushing rate both increase as speed increases. The crushing rate increases when space is too small or too big, and the cracking rate is high when space is small. The main factors which influence the cracking performance were found out by the orthogonal test and the range analysis. The results indicate that space is a primary factor and speed is secondary, and the optimal speed and space are as follows: 20 mm/min, 17.4 mm.