A highly efficient diode-laser-pumped intracavity frequency doubled and Q-switched Nd:YVO4 laser is presented. Q-switched operati on of the laser was realized by using an intracavity KTP crystal, which was also used as a frequency doubling crystal in type II phase matching for generating green laser. In CW operation, a green output of 115 mW and optical-to-optical conversion efficiency of 14.4% were observed at 800 mW pump power. In Q-switch operation, a pulse width of 5.45 ns and a peak power of 74 W of the green laser were achieved at a 100 Hz repetition rate.