In order to study the thermal effect of laser scanning angle on carbon fiber reinforced plastics and the influence of scanning angle on the laser energy transfer process inside the material,the common fiber laying angles 0°,45°and 90°were used as the laser scanning angles to carry out finite element simulation and experimental verification. The results show that with the increase of scanning angle,the thermal influence range of laser on material gradually increases；when the scanning angle is 45°,the carbonization of fibers on both sides of the slit is more serious. Through the laser cutting experiment,it is found that the error between the simulation and the experiment is 7.46%. The simulation and experiment show that the scanning angle has a trend of thermal influence on material,and the scanning angle has a consistent result on the carbonization of the fiber. In order to reduce the thermal effect of laser cutting on materials and the carbonization area of materials,and improve the laser cutting quality of materials,in addition to selecting appropriate laser parameters,the laser scanning angle should be consistent with the fiber axis as much as possible.