Research on high power continuous-wave and cavity dumped Yb∶YAG thin disk lasers is conducted. Based on the plane-wave quasi-three-level laser model, the parameters of Yb∶YAG thin disk laser are optimized. The maximum output power in laser diode pumped Yb∶YAG thin disk laser at 1030 nm reaches 100 W with an optical-to-optical efficiency of 50.2% and a slope efficiency of 56.8%. By using RTP electro-optical Q-switched, the cavity-dumped Yb∶YAG thin disk laser at 1030 nm is constructed. A constant pulse duration of 20.2 ns is achieved within the repetition rate from 10 kHz to 100 kHz. The maximum output peak power at 1030 nm achieves 109.8 kW with a repetition rate of 10 kHz.