Steel　floral　pipe　is　one　of　the　key　load-carrying　components　of　advanced　pipe　supporting　structures.　Propagation　characteristics　and　inspection　potential　of　low　frequency　longitudinal　guided　wave　modes　in　steel　floral　pipes　were　investigated　by　using　finite　element　analysis.　Finite　element　model　of　low　frequency　longitudinal　guided　wave　mode　propagation　in　steel　floral　pipe　distributing　small　grouting　holes　was　established.　L(0,　2)　mode　at　30　kHz　was　optimized　for　the　inspection　of　steel　floral　pipes.　The　change　of　hole　number　had　no　significant　effect　on　the　amplitudes　of　the　first　and　second　end-reflected　echoes　of　L(0,　2)　mode　at　30　kHz　when　the　diameter　of　small　grouting　hole　was　kept　to　be　10　mm.　However,　group　velocity　of　this　mode　linearly　decreases　with　the　increase　of　the　hole　and　to　be　0.76　m/s　with　the　increase　of　every　hole.　The　effect　of　hole　diameter　on　propagation　velocity　of　longitudinal　guided　waves　mode　was　also　simulated　when　the　hole　number　kept　constant.　It　was　shown　that　the　change　of　hole　diameter　had　limited　effect　on　the　energy　propagation　of　this　mode.　Number　and　diameter　of　holes　less　affect　to　the　amplitude　of　end-reflected　echo.　It　was　shown　that　low　frequency　longitudinal　guided　waves　had　potentials　to　inspect　long　range　steel　floral　pipes　nondestructively.　However,　with　the　increase　of　the　hole　diameter,　group　velocity　of　this　mode　will　decrease　gradually　in　varying　degree.　These　simulation　results　provide　a　basic　foundation　for　nondestructive　inspection　of　steel　floral　pipes　by　using　low　frequency　longitudinal　guided　wave　modes.