The characteristics of acoustic-optic double-clad fiber laser end-pumped by diode laser are reported for different pumping constructions. The comparison and discussions of average power, pulse width and stability of Q-switched pulses under the forward pump and back ward pump conditions are presented. In experiment, the output of Q-switched pulses with 60% slope efficiency of average power, 52ns pulse width and 03mJ single pulse were obtained at the repetition rate of 10kHz. Finally, the rate equations with different pump configurations are deduced to analyze the Q-switched pulse, and the theoretical results agree with well experimental results.