Internal　stretch　forming　space　lattice　structure　(ISFSL),　composed　of　upper　chord,　lower　chord,　vertical　web　member　and　lateral　support　member,　is　a　novel　space　structure.　As　a　key　bearing　member　of　ISFSL,　the　upper　chord　ring　beam　is　a　cross　center　of　all　upper　chord　beams.　When　a　new　type　of　construction　method-tensioning　group　by　group　and　step　by　step　being　chosen,　the　internal　force　increasing　and　decreasing　on　structural　members　belonging　to　different　group　inevitably　comes　into　being,　which　is　different　from　the　method　tensioning　simultaneously.　And　properly　reinforced　upper　chord　ring　beam　will　weaken　the　force　different　in　a　great　extent.　Aiming　at　putting　it　into　practice,　the　paper　makes　a　detail　analysis　on　structural　force　affected　by　upper　chord　ring　beam.