Abstract: Digital dictionary is an important part in automatic Chinese word segmentation and part of speech tagging，which is also a vital factor affecting system performance.This thesis introduces the necessary searching functions and common components for a digital dictionary and proposes an extendable mechanism which consists of system dictionary and user dictionary.The system dictionary is indexed with initial character hash table characterized with character-based binary tree structure.The user’s dictionary is also indexed with initial character hash table but augmented with linking structure.Experiment shows that the system is extendable in practice.

Key words: digital dictionary, dictionary structure, automatic word segmentation, hash

摘要： 在中文自动分词及词性标注系统中，电子词典是系统的重要组成部分，也是影响系统性能的重要因素之一。介绍了电子词典应该具备的查询功能及常用的组织结构，给出了一种结构为系统词典+用户词典的可扩展式电子词典机制。其系统词典是基于首字Hash散列的逐字二分词典结构，用户词典采用基于首字Hash散列的链接表词典结构，具有很强的扩展性和实用性。

关键词: 电子词典, 词典结构, 自动分词, Hash