：With a graphic analysis method,the parameters of three-mirror V-type folded cavity by diode laser end-pumped are optimized,which make the cavity not sensitive to the variation of thermal lens effect of laser crystal,and obtain stable TEM00 mode output easily.When putting the nonlinear crystal KTP at the waist of fundamental wave,we got diode laser end pumped Nd∶GdVO4/KTP cw green laser.At 19.7W end pump power,3.68W of continuous output green laser was obtained.Considering of the loss of coupling system,the optical-optical conversion efficiency of this all-solid-state laser was 21%.