关键词: 面向对象数据库, 安全保护, 授权机制, 隐授权, 授权检验

Abstract: Due to the special principle of data structure and manipulate principle，OODB has a particular safe protection and authorization methods.This paper first introduces the feature of security mechanism of OODB，and then based on the discussion on subject hierarchy，object hierarchy and operation hierarchy to focus on the authorization check process and authorization mechanism of OODB.By implement an instance combined with other authorization methods to validate the improvement of flexibility of implicit authorization mechanism.

Key words: Object-Oriented Database（OODB）, safe protection, authorization mechanism, implicit authorization, authorization check