Based on filed measured date and calculated result about the internal force of the anchor piles retaining structure in Handan,the reinforcement stresses and moments of the piles along with the excavation of the deep pit are studied in this paper.Internal force of the pile body increase with the depth of foundation ditch during the excavation.The reinforcement stresses is heavily associated with the exposure time,the pile body displacement and applying of the pre-stress anchorage.The elastic method is more scientific than classic method on the base of analysis between actual result and theoretical result of the pile's stress so as to provide structure of pile and anchorage with foundation.