A　temporal-spatial　focusing　inspection　system　for　ultrasonic　guided　wave　in　pipeline　based　on　time　reversal　focusing　theory　is　presented　in　this　paper.　The　system　can　be　used　to　excite　piezoelectric　transducer　arrays　and　focus　the　energy　of　guided　waves　at　flaw.　The　key　design　techniques　of　this　system　are:　an　excitation　circuit,　which　is　based　on　the　improved　direct　digital　synthesis　(DDS)　for　synthesizing　and　emitting　time　reversal　signal,　and　a　small　size　wide　band　pulse　amplifier　with　high　power　output　and　linear　features.　With　this　system,　the　signal　echoed　from　the　crack　can　be　enhanced　based　on　time　reversal　temporal-spatial　focusing　effect.　Under　particular　test　conditions,　experimental　work　using　a　transducer　array　with　eight　channels　was　carried　out　in　a　pipeline　with　an　artificial　flaw.　The　result　shows　that　the　amplitude　of　the　echo　signal　from　the　flaw　increases　by　246%　compared　with　that　of　the　normal　test　signal.　In　addition,　the　signals　obtained　from　the　temporal-spatial　focusing　process　have　a　higher　signal　to　noise　ratio,　and　the　dispersion　and　multimode　that　occur　in　normal　test　signal　are　restrained.