Preliminary influence factor analysis of beam quality of high-average-power and high-beam-quality intracavity frequency doubled green laser is presented. The methods of improving beam quality such as optimal design of resonator cavity and compensation of thermal effects are described. The corresponding experimental research is done. With the control of beam quality, the green laser power of 63.7 W is obtained in a 8 mm×8 mm×12 mm KTP crystal with an M2 value of 9.65 and an optical-to-optical conversion efficiency of 9.7% at a pulse repetition rate of 10 kHz, and the green laser power of 79 W is generated in a 8 mm×8 mm×30 mm LBO crystal with an M2 value of 6.46 and an optical-to-optical conversion efficiency of 9.8% at a pulse repetition rate of 15 kHz.