A cw frequency stability and intracavity frequency doubled ring Nd∶YVO 4/KTP end pumped by a laser diode through fiber coupling is designed and experimentally demonstrated. Using the side band frequency locking technique, up to 1.5 W green output with the frequency stability better than 620 kHz is achieved by the pump power of 11 W. The conversion efficiency from light to light is 13.6% and the fluctuation of output power is less than ±1.5%.