关键词: 汉语分词, 覆盖歧义, 交叉歧义, 局部歧义词网格

Abstract: This paper presents the concept of local ambiguity word grid.Aiming at the overlay ambiguity in Chinese word segmentation，the article puts forward an algorithm that applies iterative algorithm to train overlay ambiguity dictionary and then a backup lexical item dictionary of overlay ambiguity can be obtained.On this basis，the paper brings in a word segmentation algorithm based on local ambiguity grid which is capable of detecting compounding ambiguity and overlay ambiguity emerging from the process of Chinese word segmentation.This algorithm just calculates a local ambiguity grid instead of the entire ambiguity section and simplifies the processing of overlay ambiguity to just inquiring into the backup dictionary of the related overlay ambiguity，the new approach will help reduce the processing time remarkably.The experiment demonstrates that the algorithm can fulfill the rapidness of segmenting Chinese words and the correctness can reach the level of 97%.

Key words: sentence segmentation, overlay ambiguity, overlapping ambiguity, local ambiguity word grid