Abstract: limited machining space，substantial thin-wall deformation，and tool interference-the following steps were taken：First，by analyzing the machining difficulties inherent in the impellerʹs monolithic structure，a machining plan was formulated，machining paths were mapped out，cutting tools were selected，machining parameters were optimized，and the rigidity of the machining system was enhanced. Subsequently，SurfMill software was utilized to generate the machining toolpath trajectory，which was post-processed to produce NC code recognizable by CNC machine tools. Finally，five-axis CNC machining trials and process validation were conducted on the JDGR200 precision milling machine. Test results confirmed the correctness and completeness of the TC4 monolithic impeller machining process. This CNC machining methodology for monolithic TC4 impellers provides valuable reference and insights for manufacturing similar impellers.