A high energy and high stability Nd∶glass laser had been developed. Using ceramic tight package pumping cavity, a phosphate Nd∶glass rod that was pumped by two pulse xenon lamps and plane-parallel cavity resonator , it realized the output of high energy. Appling ray tracing software, the pumping light field of Nd∶glass laser rod is simulated in convergent cavity, the distribution of pump light was analyzed and the design of convergent cavity is optimized. Using main circuit of laser power supply that adopts charging circuit of series resonance of half bridge inverter type and control circuit that applies control technology of PID, it developed high stability output of laser power supply. Through the experiment analysis, the output single pulse energy of Nd∶glass is 200 J, and the pulse width is 2ms, the output stability of laser energy is ±0.7%, conversion efficiency of electricity-light is 1.9% , and beam quality M2 is 1.5.