By using a quarter-wave plate at fundamental laser wavelength in an intracavity frequency doubling laser, the difference of optical distance between the orthogonal polarized modes in KTP crystal is compensated and the instability caused by sum-frequency generation is eliminated. A high efficient, stable intracavity doubling Nd:YAG laser Pumped by alaser diode has been established. The second harmonic maximum output single-side TEMoomode is measured to be 105 mW, the amplitude fluctuation is less than ±3% in ten minutes, and total optical coversion efficiency is 14.4%.