The relationship between gain profile and pump cavity structure was studied for LD side-pumped Nd:YAG laser, the conversion efficiency and beam quality were improved by use of an advanced cavity configuration. A maximum green power of 68W was generated at 10-kHz repetition rate when the two Nd:YAG rods were pumped by total 600 W power of laser diodes, leading to 11.3% optical-tooptical conversion efficiency and 5% electrical-to-optical conversion efficiency.