The research on the spiral milling mechanism of Aramid fiber reinforced polymer could be better. Starting from the analysis on the spiral milling experiment of the Aramid fiber reinforced polymer, the work aims to systematically study the surface burr defect area, chip morphology, tool wear and changes of cutting force under a specific range of cutting parameters by the response surface method, variance analysis, t-test, and other methods, so as to explain the special nodular chip in the spiral milling process.