A　high-energy　quasi-continuous-wave　(QCW)　laser　diode-pumped　regenerative　amplifier　was　demonstrated　for　using　as　a　radiation　source　of　laser-induced　plasma.　The　seed　source　was　an　all-fiber　amplifier,　provided　pulse　width　of　454　ps　and　single　pulse　energy　of　7.7　nJ　at　a　repetition　rate　of　24.17　MHz　and　a　central　wavelength　of　1063.9　nm.　The　solid-state　regenerative　amplifier　used　a　Nd:　YAG　crystal　was　side-pumped　by　QCW　diode　bars.　With　this　system,　high　stability　and　high　energy　was　generated　at　wavelength　of　1064.1　nm,　with　pulse　width　of　392.1　ps　and　output　average　power　was　4.04　W.　The　single　pulse　energy　and　peak　power　was　8.08　mJ　and　20.6　MW,　respectively.　The　M2　factor　was　about　1.48.　The　laser　system　will　use　as　a　picosecond　radiation　source　for　the　following　laser　ablation　and　laser-induced　plasma　spectrum　analysis.　In　the　previous　work,　the　process　of　laser-induced　plasma　was　simulated　by　fluid　dynamics.　The　temporal　and　spatial　distribution　of　electron　density　and　temperature　was　successfully　simulated,　corresponding　the　process　of　laser　irradiation　on　target　were　recorded　for　set　of　materials　(Si,　Al,　Cu).　Finally,　the　mechanism　and　evolution　process　of　the　picosecond　laser　irradiation　target　were　obtained.