A LD-pumped Nd∶YVO_4 laser passively Q-switched at 1.34 μm by using V∶YAG which is a new type of crystal saturable absorber.The relationship between the stability of pulse laser and the small signal transmission of V∶YAG was studied.The results show the laser is stable when the V∶YAG with smaller signal transmission is used.When the pump power is 1.6 W,the stability of pulse energy and repetition rate for 4 hours is 15%,10,5% for V∶YAG with small signal transmission of 96%,89%,85%,respectively.The results of average power of 96mW,minimum pulse width (FWHM) of 8.8 ns,pulse repetition rate of 25 kHz,peak power of 436 W and pulse energy of 3.84 μJ were obtained for small signal transmission of 85%.