A　novel　construction　method　without　scaffold　work　called　as　assembly-prestressing　form　finding　loop　by　loop　is　presented.　Based　on　the　theory　of　finite　displacement,　the　cycle-forward　analysis　method　is　presented　for　its　construction　calculation,　which　adopts　the　finite　element　method　of　generalized　geometric　nonlinearity　combined　with　the　application　in　the　real　construction　process.　By　means　of　the　combination　of　the　forward　analysis　according　to　real　construction　sequence　and　the　cycle　iteration　according　to　the　initial　strain　increment　method　of　cable　force　adjustment,　the　influence　of　the　structural　geometric　nonlinearity　and　the　loss　of　prestress　are　taken　into　account　due　to　prestressing　of　tendons　in　turn　and　so　on.　If　the　initial　cable　forces　derived　from　the　method　were　used　for　construction,　expected　cable　forces　and　shape　could　be　assured　easily.　Simulation　analysis　achieved　real-time　tracking　and　controlling　of　the　construction　status.　Finally,　according　to　the　procedure　and　parameters　in　simulating,　a　model　experimental　research　on　the　stage　of　form　finding　(namely　prestressing)　was　carried　out　for　suspen-dome　structure.　The　feasibility　on　the　assembly-prestressing　form　finding　method　loop　by　loop　was　testified.　The　cycle-forward　analysis　method　was　established　and　numerical　simulation　was　performed,　and　the　results　show　that　it　was　useful　for　the　design　and　the　construction　of　similar　suspen-dome　structure.