This paper uses a large object system & PG-RELIEF to review the common requirements of management of persistent objects in large object system. As an example, a unified persistent object management framework based on object-oriented paradigm is presented and analyzed. 以大型对象系统PG-RELIEF为对象,考察一般大型对象系统在持久化管理上的需求,然后提出基于面向对象范型的统一对象持久化框架并对之进行分析。