Enhancement of Cr,Yb∶YAG self-Q-switched microchip laser by bonding Yb∶YAG ceramic is investigated. Yb∶YAG/Cr,Yb∶YAG self-Q-switched microchip lasers is demonstrated. Average output power of 0.53 W is obtained under absorbed pump power of 7.1 W. Laser pulses with pulse energy over 25 μJ, pulse width shorter than 3 ns and peak power over 9 kW are achieved. The effect of transmission of output coupler on the laser performance is also addressed.