To meet the requirements of computed radiographic (CR) system,a new high-performance laser scanning optical system is designed.In view of differences in performances of scanning methods,a scanning arm which is composed of pentagonal prism and scanning object lens is designed.The scanning arm is used to replace the f-θ lens.To cooperate with scanning arm,a circular imaging plate transport mechanism is designed.The scanning arm also receives stimulation fluorescence as a receiving device.The performance of object lens is analyzed using the Zemax software.The performance of mechanical structure is simulated by using the finite element method and the rotational speed of scanning arm is confirmed.The influences of the following factors that the incident light out of vertial to the pentagonal prism and there is location error of the pentagonal prism on the system′s resolution are studied.The results reveal that the system is easily adaptive to the error and can be used widely.Experiments are carried out to verify the performance of the laser scanner.Moreover,the results indicate that the images have good visual effect and can meet requirements of industrial inspection.