To　investigate　the　influence　of　aspect　ratio　and　width-to-thickness　ratio　on　the　axial　compression　behavior　of　square　pultruded　glass　fiber-reinforced　polymer　(GFRP)　tubular　stub　columns,　axial　compression　tests　were　conducted　on　12　GFRP　tubular　columns.　The　mechanical　properties　of　the　GFRP　tubular　columns,　including　load-bearing　capacity,　initial　stiffness,　compressive　toughness,　and　ductility　coefficient,　were　analyzed.　The　test　results　reveal　that　all　GFRP　tubular　columns　exhibit　crushing　failure,　with　specific　failure　modes,　including　mid-section　fracture　and　longitudinal　tearing　along　the　corners　of　the　columns.　The　load-bearing　capacity　is　negatively　correlated　with　the　aspect　ratio　and　width-to-thickness　ratio.　The　initial　stiffness　negatively　correlates　with　the　aspect　ratio,　and　the　compressive　toughness　negatively　correlates　with　the　width-tothickness　ratio.　The　Hashin　damage　criteria　for　the　C3D8R　solid　element　was　developed　by　utilizing　the　explicit　finite　element　subroutine　ABAQUS-VUMAT　to　analyze　the　axial　compression　behavior　of　GFRP　tubular　columns.　Through　parameter　analysis,　the　relationship　between　the　load-bearing　capacity　and　fiber　orientation　was　obtained,　and　an　empirical　equation　for　predicting　the　load-bearing　capacity　of　the　GFRP　tubular　column　was　proposed.