High repetition rate short pulsed seed laser output at the wavelength of 1910 nm is achieved by utilizing the home-made Tm-doped YLF(Tm:YLF) crystal.The crystal size is 1.5 nm×6 nm×20 mm,and the doping atom fraction is 2%.With the cavity length of 90 mm,by employing different transmissions (T) and radii (R) of the output mirrors,the highest slop efficiency of 25.6% is obtained with T=10% and R=250 mm.In addition,pulsed laser is amplified based on the main-oscillator power-amplifier (MOPA) system by using high-power Tm-fiber amplifier.With the pump power of 100 W and repetition rate of 500 Hz,the laser output with the peak power of 630 kW and pulse energy of 63 mJ is obtained.