A compact high-energy solid-state Nd∶YAG master-oscillator power amplification system side-pumped by laser diode is presented. We use the thermoelectric cooler in the whole system, and a compact and miniaturized laser system is achieved. A Nd∶YAG crystal rod with diameter of 7 mm, length of 100 mm and doping concentration (atomic number fraction) of 1.1% is used in the master oscillator. We obtain a laser pulse with maximum pulse energy of 350 mJ, pulse width of 9.7 ns under repetition rate of 10 Hz. A Nd∶YAG crystal rod with diameter of 7.5 mm, length of 134 mm and doping concentration of 1.1% is used as gain medium in power amplification stage. Finally, we obtain the laser pulse with energy of 700 mJ and pulse width of 10 ns.