Since　the　basic　theory　of　the　discontinue　deformation　analysis　(DDA)　method　was　proposed,　the　DDA　open　source　has　gone　through　a　long　development　process.　At　present,　different　kinds　of　programs　have　been　widely　applied　in　rock　mass　engineering　such　as　slope,　dam,　and　tunnel.　This　paper　introduces　the　solution　principle　of　DDA　motion　equations　in　detail,　as　well　as　the　development　status　of　the　2D　open-source　program.　Numerical　simulation　of　shaking　table　test　of　rock　mass　engineering　using　2D　DDA　program　is　highlighted,　and　investigations　of　seismic　wave　pre-processing　and　seismic　input　method　are　carried　out.　First,　based　on　the　Newmark　integration　scheme,　the　integration　algorithms　of　synthetic　or　measured　seismic　wave　time　history,　correction　function　of　seismic　wave,　and　DDA　simulation　are　unified.　Then,　three　seismic　input　methods　are　implanted　in　the　DDA　program,　and　the　applicability　of　various　seismic　input　methods　is　discussed.　On　this　basis,　using　the　improved　seismic　2D　DDA　program,　a　shaking　table　test　of　typical　rock　mass　engineering　is　simulated.　Through　the　comparison　between　the　theoretical/test　data　and　simulation　results,　the　reliability　of　the　improved　DDA　program　in　seismic　response　analysis　is　verified;　the　large　mass　method　and　the　large　stiffness　method　are　more　suitable　for　rigid　foundation,　such　as　shaking　table　test;　the　propagation　of　the　seismic　wave　presents　a　significant　amplification　effect　due　to　the　reflection,　refraction,　and　diffraction　in　the　tunnel.　The　research　results　provide　DDA　theory　and　an　open-source　program　for　analyzing　the　seismic　response　of　rock　mass　engineering.