16-passes pump system for thin-disk laser was designed. The thin-disk was made inland with the diameter of 10 mm, thickness of 200 μm and doping atom fraction of 10%. A micro-channel cooler was used to cool the thin-disk effectively. Based on the system , a Z type cavity was designed in this experiment. An LBO crystal was used as the nonlinear crystal for intracavity frequency doubling. Using an acousto-optic Q-switcher, with pulse repetition rate of 5 kHz , a green laser of TEM00 mode with an output power of 10.2 W at 515 nm was achieved, with M2x of 1.3 and M2y of 1.6 at the optical-to-optical conversion efficiency of 12.5%. The pulse duration was 150 ns.