With the rapid development of semiconductor array pumped Nd∶YAG solid laser,the application range is gradually widened.Its volume、energy and environmental adaptability have gradually become import indicators to measure the performance of laser.In order to meet the requirements of laser irradiation field, a miniaturized,high-energy,non-temperatuer controlled side-pump Nd∶YAG electro-optic Q-switched laser was developed in a wide temperature range-40～60℃.Multiple multi-wavelength(3-λ) arrays are used as pump sources,5mm×64mmNd∶YAG crystal round rod is used as working material,and LN crystal is used as electro-optic Q-switch.In the wide temperature range,the laser works normally,and the laser energy can be kept above 55mJ at 20Hz and 60mJ at 1Hz when the single pulse output.The size of the whole machine is 140mm×60mm×39.5mm, which can meet the development requirements of laser miniaturization,light weight and strong environmental adaptability.