Abstract: Influence of position of output mirror on beam of two-rod solid-state laser has been analysed by means of matrix optics and experiment. The results show that the stability zone,the mode volume and the output power of two-rod solid state laser are affected by the position of output mirror. The mode volume and output power of equal interval resontor are larger than the other resontors.The facula radius w0 and the far field divergent angle θ0 are also affected by the position of the output mirror.The optimum transmissivity of output mirror for two-rod solid state laser has been investigated by experiment.