Abstract: An uncooled, passively-Q-switched laser with wide-temperature-range is reported. According to the dependences that the wavelength of laser diode drifts with temperature, a superimposed combination of different wavelength points was made. The thermal property was simulated by Ansys and it turns out that the optimized pump structure can meet the requirements of natural cooling. The best reflectivity of output mirror and small-signal transmission of the saturated absorber are confirmed to be 28% and 36%, the output energy and pulse width is 9.8 mJ and 9 ns, respectively. Based on above results, a 1064 nm laser output with single pulse energy of 8.6 mJ and pulse width of 9.7 ns was developed in the temperature range of 35-55 ℃ without refrigerating. The output instability is less than 5% for one array working and 12% for array switching.