With its wide-spread application in various fields,1064 nm/532 nm dual-wavelength solid-state laser has given rise to a bunch of studies upon its optical path switching output. In contrast,there is still a lack of study of composite output. A new dual-wavelength composite output laser with high-repetitive frequency was designed. Firstly,an equivalent resonator model with thermal lens was established,and then the optimum cavity length was determined by combining the stability of resonator and the theory of “near thermal unstable resonator”,then the influence of the frequency doubling crystal length,the fundamental wave(FW) transmissivity of the output mirror,and the Q-switch frequency on the composite output was analyzed by means of software simulation,finally,the optimum composite output parameters ware determined according to the actual requirements of the double channel laser jamming. The experimental results show that when the length of KTP crystal is chosen as 12 mm,the FW transmissivity of the output mirror is fixed to 15%,and the Q frequency is selected as 50 kHz,the average output power of the FW is 28.82 W,and the average power of the output of second-harmonic wave(SHW) is 2.23 W under maximum pumping power. The product of the laser near field divergence angle and the laser spot radius is close to the product of the divergence angle of the fundamental model Gauss beam and the radius of the spot in the same position. The results show that the designed laser works in approximate fundamental mode under the maximum pumping power,and it has better beam quality.