In　order　to　catch　on　the　forming　performance　of　the　stretch　forming　lattice　structure　(SFL),　upper　chord　cross　section,　web　member,　rigid　arm,　high-span　ratio,　diameter　and　stiffness　of　center　ring　are　selected　as　the　main　parameters　affecting　the　forming　process　of　SFL,　which　basing　on　the　structural　property.　Taking　practically　tensioning　method　into　consideration,　a　study　of　parameter　effect　on　the　forming　process　is　carried　out　as　far　as　an　SFL　with　a　long　span　of　100　m　is　concerned　by　the　theoretical　simulating　and　analysis.　The　result　shows　that　upper　chord　cross　section,　rigid　arm　number,　high-span　ratio　are　the　most　important　factors　affected　the　shaping　process.　The　other　parameters　have　little　effect　on　forming　process.　It　is　favorable　to　the　erection　of　SFL　into　its　final　configuration　to　choose　reasonable　stiffness　of　rigid　arm.　The　structural　properties　about　the　forming　process　affected　by　the　parameters　are　also　given.