Abstract: The retaining structures for deep excavation of Longquan International Park in Qichun County, Huanggang City of Hubei Province are taken for an instance. Owing to unsmooth bedrock formations, the problem of inadequate embedded depth of retaining piles in deep excavation is studied. Good results are achieved by using longer and more dense anchors, reserved soil platforms before retaining piles and other measures. Meanwhile, some construction points of mixing pile, anchor and confining prison in similar formations are summarized and analyzed according to the project implementation process.