In order to study the output mode distribution of the corner cube resonator (CCR),a reflection model of corner cube with dihedral angle errors was built with matrix optics and vector operating methods.The formula and numerical simulation method for studying the output mode of CCR are presented.The output modes of CCR without and with dihedral angle errors were simulated with Fourier transformation method and Fox-Li iterative method.The results show that the output mode of CCR without dihedral angle errors consists of six uniform symmetric pieces,while the intensity distribution of the six pieces of the output mode of CCR with dihedral angle errors is asymmetric.