Based on a graph-model-database integration maintenance mode, with object-oriented technology, a maintenance system applied in the AC and DC system is developed in this thesis.

本文基于一种图形数据一体化的维护方式，采用面向对象技术，实现了一个适用于交直流系统的维护系统。

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Then the paper focuses on the key techniques used in each part of the system emphasizing the Object-Oriented technique, graph technique and database technique.

接着对于系统各个部分所用到的关键技术进行了阐述，重点对面向对象技术、图形技术和数据库技术等进行了详细的说明。

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Then the paper focuses on the key techniques used in each part of the system emphasizing the Object-Oriented technique, graph technique and database technique.

接着对于系统各个部分所用到的关键技术进行了阐述，重点对面向对象技术、图形技术和数据库技术等进行了详细的说明。

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