A compact electro-optical Q-switched 1 064 nm Nd:YAG laser end-pumped by high temperature Laser Diode Arrays (LDAs) was demonstrated. In order to achieve the compactness, high-temperature LDAs were used as the pumping source because it can effectively reduce the heat dissipation need within the system. The temperature field of the high temperature LDAs was simulated using Ansys. Lens duct made out of K9 glass was used as the coupling lens to couple the pumped light into the Nd:YAG crystal. The light field distribution before and after the coupling lens was simulated by Traceproc software. The gain medium was a 5 mm×5 mm×40 mm Nd:YAG with a doping concentration of 1.0 at.%. The internal temperature field distribution of the crystal under 200 μs and 250 μs pump pulse width was simulated by Ansys, and the focal length of the thermal lens during laser operation was calculated. The experiment results show that this compact laser can achieve stable pulsed laser output. With a repetition frequency of 20 Hz and the pump source voltage pulse widths of 250 μs and 300 μs, output pulsed energy of 44.1 mJ and 50.2 mJ were achieved corresponding to the pulse durations of 18.3 ns and 21.3 ns. The slope efficiency were 12.35% and 12.24%, respectively.