A detail description of LD pumped intracavity-doubling ring laser is presented. The ring laser is pumped by an 808 nm LD which has a fiber-tail with maxim output of 810 mW. Using YVO4 and KTP as the laser crystal and doubling crystal, a maxim of 2 mW 532 nm TEM00 mode green laser is achieved. Laser frequency can be tuned about 12 GHz by moving one of the cavity mirror with PZT.