The potentiality of a laser diode pumped solid state laser system to drive a laser fusion reactoris described. The laser fusion reactor driver probably requires a few mega-joule output at thewavelength of 0.35μm, a 10 percent overall efficiency, and a 10 hertz repetition frequency. Using laser diode pumping and a regenerative amplifier, the solid-state laser system is shown tohave a sufficiently high efficiency (over 10 percent), long lifetime (over 3 years at 10 hertzoperation), and a high repetition frequency (over 10 hertz) owing to its small thermal load tolaser materials such as Nd: phosphate-glass, Nd: SiO2, Ho: YAG, and Tm: YAG. Futureitems to be developed with the system are also discussed.