Various influence factors on chopping yield of maize stalk were analyzed and the conditions of better levels of influence factors were discovered, which were as follows: feeding distance position near fixed blades side, forward speed of 0.6~0.8 m/s, rotational speed of cutter head of 1576r/min. Under the conditions of better levels of each influencing factor of maize stalk chopping effect , by using high speed photography and vast experiments, three motion laws were reached, which were through the below stages, instant of contacting with cutter head, process of chopping and after chopping.