The　crack-tip　dynamic　amplification　and　shielding　by　micro-cracks　in　an　unbounded,　two-dimensional,　homogeneous　and　linear　piezoelectric　solid　are　studied　in　this　paper　using　a　time-domain　boundary　element　method　(BEM).　The　BEM　is　based　on　the　time-domain　hypersingular　traction　boundary　integral　equations　(BIEs).　A　quadrature　formula　for　the　temporal　discretization　is　adopted　to　approximate　the　convolution　integrals　and　a　collocation　method　for　the　spatial　discretization.　Quadratic　quarter-point　elements　are　implemented　at　all　crack-tips.　A　novel　definition　of　the　dynamic　amplification　ratios　of　the　dynamic　field　intensity　factors　and　the　mechanical　strain　or　electrical　energy　release　rate　is　introduced.　Then　the　influences　of　various　loading　conditions,　the　location　and　orientation　of　the　micro-cracks　on　the　dynamic　amplification　ratios　are　investigated.　Compared　with　the　corresponding　static　amplification　ratios　as　presented　in　Part　I,　some　interesting　and　useful　findings　are　presented　together　with　a　simple　method　which　is　very　feasible　for　engineering　applications.　(C)　2013　Elsevier　Ltd.　All　rights　reserved.