But, according to some investigations on cost management of construction projects, there are at large and even very severity cost overrun risks, which are general estimates over rough estimates, budgetary estimates over general estimates and final accounts over budget. 但从近些年来的相关调查发现,在我国建设项目成本管理中存在普遍而且非常严重的三超(概算超估算,预算超概算,决算超预算)问题。