Abstract: The bracing engineering of deep foundation pit is a complicated system engineering，theoptimum decision-making on bracing schemes is a key link in design system. Scheme optimizationcan be considered asa multiple attribute decision-making analysisproblem ，analytic hierarchy pro?cess is a method of analysis and strategic decision for the complicated system with more influentialfactors ，itisoftenusedfortheoptimalevaluation.Establishesanoptimummodelofbracingschemesfor deep foundation pits through improved analytic hierarchy process with self-adjusting function ，acasestudyshowstheimprovedmethodispracticalandeasytoapply.

Key words: deepfoundationpit , schemeoptimization , improvedanalytichierarchyprocess