For　the　problem　of　huge　difference　between　the　actual　stress　in　retaining　structures　of　deep　foundation　pit　and　theoretical　calculation,　this　paper　analyzed　those　data　measured　from　YA-AO　Square　in　Beijing.　The　results　show　that　the　stress　in　retaining　piles　is　no　less　than　100　MPa,　which　is　far　less　than　designed　strength,　and　the　pulling　force　of　anchors　is　1/3-1/2　of　designed　value,　which　provide　valuable　references　for　similar　projects.