Abstract: According to the computer in the semantic networks combination of overlap type out the problem of righteousness vocabulary, through the analysis of the traditional word segmentation method defects.Based on the maximum probability calculation method of automatic word segmentation ambiguity.Application for the semantic relatedness produces different meanings to the context of vocabulary, effective correction to the calculation of the segmentation candidates from the word of effective "expenses", the most probability calculation method to produce ambiguity of vocabulary connection degree probability calculation, overcome the shortcomings of the traditional word segmentation method.Successfully solve overlap type righteousness, serial overlap type, combination and mixed segmentation problem, eliminate righteousness in the semantic networks and combination of overlap type out the effect of vocabulary righteousness, and achieved good effect.