By using the advantage of pulsed semiconductor lasers with high peak power, a pulsed LD-pumped cavity-dumped oscillator and power amplifier is built, and the pump light and signal light of the system are matched. In addition, external cavity second harmonic experiments are also carried out. The results show that, the pulsed LD pumping system has a very compact structure, it can increase the energy output in oscillator and amplification stage oscillator, and can better eliminate thermal distortion effects. Pulse width of 3.7 ns and laser pulse energy of 4 mJ can be obtained in the stage of the oscillator. Through the power amplifier and the second harmonic generation (SHG), the second harmonic light with the pulse width of 3.4 ns, pulse energy of 3.2 mJ, SHG efficiency of 40%, pulse peak stability of 5% (root mean square) and divergence angle of 0.5 mrad is obtained.