In　this　paper,　an　error-adjustable　sleeve　connection　was　proposed　for　spatial　grid　structures　with　medium　and　small　span.　The　proposed　connection　can　be　disassembled　and　assembled　repeatedly　through　threaded　connection.　It　shares　the　abilities　for　adjusting　the　angle　error　and　length　error,　which　is　convenient　for　installation　and　construction.　To　investigate　the　mechanical　properties　of　the　connection,　the　solid　model　of　the　connection　was　established　based　on　ANSYS.　The　finite　element　analysis　of　the　connection　subjected　to　tension,　compression　and　bending　was　carried　out　to　evaluate　the　stress　status　and　failure　mechanism　of　each　part　of　connection.　According　to　the　parameter　analysis,　the　influence　of　the　thicknesses　of　welded　ball,　joint,　sleeve,　inner　and　outer　ring　and　joint　gap　on　the　bearing　capacity　of　the　connection　was　conducted.　The　results　indicate　that　the　weakness　of　the　connection　locates　at　the　inner　and　outer　ring.　With　the　increasing　of　welded　sphere　wall　thickness,　the　tensile,　compressive　and　flexural　capacity　of　connection　increase　gradually.　The　increasing　of　the　joint　wall　thickness　will　rise　the　bearing　capacity　of　the　connection.　However,　once　the　wall　thickness　reaches　to　1/2　times　of　the　joint　radius,　the　bearing　capacity　of　the　connection　will　not　change.　With　the　increasing　of　sleeve　wall　thickness,　the　bearing　capacity　of　the　connection　is　getting　large　gradually,　but　the　rate　of　increase　will　slow　down.　The　minimum　wall　thickness　of　the　inner　and　outer　ring　makes　little　effect　on　the　stiffness　and　bearing　capacity　of　the　connection.　The　joint　gap　has　little　effect　on　the　bearing　capacity　and　stiffness　of　the　connection.　©　2021,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.