Four　formwork　support　units　were　experimental　studied　by　heaping　load,including　three　glass　fiber　mat　reinforced　thermo　plastics　(GMT)　formwork　support　units　and　one　18mm　plywood　formwork　support　unit.　Compared　with　18mm　plywood　formwork　support　unit,　the　vertical　poles　force　distribution　in　GMT　formwork　support　units　were　analyzed.　The　experimental　parameter　also　included　vertical　poles　height　difference　and　their　values　were　follows:　0mm,　2mm　and　4mm.　The　results　showed　that　the　vertical　poles　force　distribution　are　uneven　in　GMT　formwork　support　unit　and　vertical　pole　height　differences　have　influence　on　their　force　distribution.