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

摘要： 面向对象数据库（OODB）独特的数据组织与操纵原理，决定了其具有不同于传统关系数据库的安全保护和授权模式。介绍了OODB安全授权机制特点，通过对OODB安全授权模式的主体、客体及访问方式三个层次的讨论，重点对授权检验流程及这三个层次上的隐授权机制进行了研究，通过尝试在实例中结合其他几种授权方式的应用，表明了隐授权机制的有效性和灵活性。

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