Abstract: In order to establish a LD-pumped Nd∶GdVO4/KTP laser system and improve the thermal stability of the green laser, the relation that the spot radii w2 and w3 vary with the thermodynamic parameter 1/ft were investigated with the graphic analysis method, and the parameters of three-mirror Z-type folded cavity insensitive to the variation of thermal lens effect of laser crystal were acquired by the calculation with Mathematics software. The continuous output green laser whose wavelength is 531.5nm and power is 2.72W was obtained at 20.3W end-pumping power when l1=170mm, l2=523mm and l3=152mm. The optical-optical conversion efficiency of 13% was realized with the all-solid-state laser. It is found that the laser system is insensitive to the variation of thermal lens effect when 1/ft＜0.25cm-1.