Abstract: The thermal distortions of a high average power solid-state laser could be compensated by cube corner arrays (CCA) due to the quasi phase conjugation. But the applications of a CCA have been limited when it is used as a resonator, because of the numerous cavity modes caused by its retro-reflection characteristics and the high loss caused by the edge diffraction of the CCA. The output properties of a cube corner array resonator are analyzed and a new method to obtain single mode has been proposed by using an intracavity filter to suppress the high order cavity modes. The theoretical and experimental results show that the output beam quality could be improved to nearly 5 times the diffraction limit by cube corner arrays with intracavity filter．