Deficiencies　that　the　stability　of　high　or　long　span　of　fastener-style　steel　pipe　formwork　support　is　always　considered　by　calculating　single　standing　pole＇s　stability　and　taking　some　construction　measures　were　investigated.　Sampling　inspections　of　steel　fastener　tightening　torque　were　made　in　four　construction　sites.　The　results　showed　that　more　than　eighty　percents　of　samples　can　not　meet　the　needs　of　the　specified　in　standard　and　the　average　value　samples　is　less　than　20N·m　while　the　specified　value　in　standard　is　the　range　from　40N·m　to　65N.m.　How　to　simulate　the　performance　of　fastener　correctly　is　very　important　to　the　whole　analysis　of　fastener-style　steel　pipe　formwork　support.　Coupled　joint　slip　tests　were　conducted　and　tests　factors　such　as　tightening　torque　and　new　and　old　fastener　were　considered.　Based　on　test　results,　effects　of　each　factors　were　analyzed　and　some　advice　were　put　forward.