The crops with thick-tall stem are difficult to be harvested by machine due to hardness and stiffness of the stem. In the present study, a dynamic simulation model of Arundo donax L. penetration was established by finite element numerical simulation technology, of which based on a general rotary-chain cutter for thick-tall stem. The results showed that the optimized matching parameters of cutting process for cutting and feeding speed were 2.80m/s and 1.00m/s, respectively. The optimal correction factor of cutting process for Arundo donax L. was 1.22. The study provided a methodological basis for the analysis of cutting process for thick-tall stems.