Based on Possion equation, a thermal model of rectangle end-pumped Nd:GdYVO4 was bulit. The crystal temperature fields of Nd:GdYVO4 were distributed. Then the distortion on pump face was calculated. When the pumping power is 12 W, the radii of pump beam is wp=320 μm, the distortion of Nd:GdYVO4 is 0.855 μm. Based on the previous calculation, the focus of thermal lens changing with input power was calculated. Using ABCD matrix to optimize cavity parameters, V-shaped folded cavity which could compress the laser mode radii on KTP effectively was selected. With the pumped power of 6.71 W, an 1.73 W output power of stable frequency-doubled green light was achieved by V-shaped folded cavity, giving an optical-optical conversion efficiency of 25.8%, and green light non-stability Δ/=1.13%.