To explore the material removal characteristics of 2.5D C/SiC composite miling， end mills and fish-scale mills were used to perform conventional milling（CM） and ultrasonic vibration-assisted milling（UAM） on 2.5D C/SiC composites. The changing laws of cutting force and cutting temperature under four milling conditions were analyzed， and the removal characteristics of 0°， 90° and z-direction needle punched fibers were studied. The results show that， compared with traditional end mill and CM， fish-scale mills and UAM can significantly reduce cutting force and cutting temperature， respectively. UAM can change the overall removal of fibers into broken removal and reduce surface defects. The combined process of fish-scale mills and UAM can greatly reduce surface defects， cutting force and cutting temperature， improve the surface quality of the workpiece， and provide feasibility for low-damage milling of 2.5D C/SiC composites.