This　paper　focuses　on　the　multiple　crack　detection　of　steel　pipelines　using　PZT-based　guided　waves.　Numerical　simulations　of　cracked　pipes　based　on　ultrasonic　guided-waves　are　conducted　by　using　the　ANSYS　finite　element　software.　Based　on　the　analysis　of　the　reflected　signal,　the　arrival　time　of　the　crack　reflection　waves　are　determined　and　the　crack　positions　are　accurately　evaluated　by　the　calculation　of　the　travel　time　and　group　velocity　of　the　PZT-based　guided　waves.　The　crack　parameters　are　numerically　altered　to　determine　how　the　parameters　impact　the　sensitive　degree　of　the　pipe　crack　damage.　To　validate　the　efficiency　of　the　numerical　simulation,　an　experiment　of　the　multiple　crack　detection　for　the　same　parameter　pipe　with　the　numerical　model　is　performed　in　the　laboratory,　and　the　results　match　well　with　the　numerical　simulation.　©　(2014)　Trans　Tech　Publications,　Switzerland.