In this paper,a passive Q-switched solid state laser with high frequency and narrow pulse width is reported.The laser is pumped through LD end-face,and the pump light is plastically coupled by self-focusing lens.Using Nd∶Cr4+∶YAG crystal,the working material of laser is bonded with Q switch crystal to get a kind of high frequency semiconductor solid laser with small volume,wide temperature range and strong shock and vibration resistance.The laser has a working repetition frequency of 10 kHz,a pulse width of about 3 ns,and a central wavelength of 1064 nm.The output peak power can reach 14.2 μJ or more at room temperature,15.2 μJ or more at 65 ℃,and the optical delay jitter of laser output is within 5 μs.