中文摘要：

指出了中间件是位于操作系统和应用软件之间的一类系统软件，它简化了分布式应用系统的开发．概述了中间件的含义，给出了中间件的一种分类方式，比较了现存的对象中间件模型，提出了对象中间件今后的发展方向及需要解决的关键问题．

英文摘要：

The development of a distributed systems can be simplified by middleware, which is layered between operating system and application systems. The concept of middleware is briefly summarized firstly , and a classification approach of middleware is given, one of the objects middleware models is then compared with another, finally advance of objects middleware and its key issue are presented.