In　order　to　study　the　mechanical　characteristic　of　Multiple　Square　Loops-String　Dome　(MSLSD),　Fuzhou　Olympics　Gymnasium　is　taken　as　the　research　background　in　this　paper,　which　is　the　first　MSLSD　project　in　China.　Tension　force,　sections　stress　and　displacement　of　the　MSLSD　under　each　construction　process　are　monitored.　The　measured　data　indicate　that　tensioning　cables　of　Square　Loops　can　reduce　the　deflection　significantly　and　improve　vertical　stiffness　of　roof.　However,　the　tensioning　cables　of　beam　strings　increase　the　roof　deflection　slightly,　which　acts　as　unloading　effect.　In　the　end,　the　vertical　stiffness　of　MSLSD　roof　increases　significantly,　and　vertical　deflection　is　enhanced　by　124　mm　after　all　prestress　constructions.　For　each　prestress　construction　stage,　the　construction　monitored　values　of　cables　tension　forces　and　sections　stresses　are　within　the　safety　range.　Meanwhile,　the　3D　finite-element　model　of　MSLSD　is　established.　In　the　model,　the　prestress　constructions　are　simulated　by　temperature　shrinkage　of　special　link　elements.　The　numerical　results　match　well　with　monitor　data,　which　validates　the　numerical　model.　©　2016,　Editorial　Department　of　Journal　of　Wuhan　University　of　Technology.　All　right　reserved.