Abstract: In order to meet the assembly requirements, the skeleton assembled by the web parts usually needs to be machined twice. Among them, the weakly rigid frame edge assembly surface is repaired due to chatter, deformation, etc, causing frequent milling damage problems, which seriously affects the assembly quality . Therefore, starting from the influence of tool structure on profile milling force, this paper designs a dense-pitch milling cutter for weakly rigid profile machining, and conducts cutting parameter matching tests based on the tool. Dimensionally optimizes cutting parameters, and calculates the optimal cutting parameters of the tool under two responses. The results show that under the optimized cutting parameters, the cutting force of profile milling is 43 N, and the surface roughness is Ra 1.04 μm.