In order to explore the mapping relations between cutting force and process parameters during milling process of carbon fiber reinforced composite (CFRP),the finite element model of CFRP milling process and simulation analysis of cutting force were carried out. Based on ABAQUS software,the CFRP milling finite element model was established by defining material properties,material failure models,fiber layup and fiber orientation,and the model was verified by cutting experiments.Based on the model,the influence of process parameters such as fiber orientation angle,milling speed,feed per tooth and rake angle on cutting force is analyzed. The simulation results show that the cutting forces decrease with the increase of the fiber angle from 0° to 90°,while the cutting force increase with the increase of the fiber angle from 90° to 180°.The cutting force increases with increasing milling speed and feed per tooth,and decreases as the tool rake angle increases.