The 1064 nm fundamental-wave (FW) and the 532 nm second-harmonic-wave (SHW) of Nd∶YAG laser have been widely applied in many fields.In some military applications requiring interference in both visible and near-infrared spectrum range,the de-identification interference technology based on the dual-wavelength composite outputs of FW and SHW will contribute to make the device or equipment compact and low-cost.Aiming at dual-wavelength composite output technology of solid-state laser,a resonant cavity with two LD pumped Nd∶YAG,two acousto-optic Q-switched and KTP cavity frequency doubling was proposed to achieve composite laser with high power and high repetition frequency.Based on steady state equation,dual-wavelength composite output model of the solid-state laser was established,and the effect of the resonant cavity parameters on characteristics and output ratio of composite laser was studied.The optimal length of frequency doubling crystal and the transmissivity of best fundamental frequency were obtained.The effectiveness of cavity parameter optimization was verified.