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In this paper,we reported a high-repetition-rate,high-power cavity dumped Yb∶YAG thin disk laser.A constant pulse width of 20.1 ns is achieved within the repetition rate frequency region between 10 kHz to 70 kHz.The average output power reaches 44 W at 70 kHz with a peak power of 31.3 kW in pulsed Yb:YAG thin disk laser.