Abstract
With the blast of information available on the web and the relevant documents set returned by search engineer can not meet the user’s needs, the question answer system research is promoted. In this paper, we introduce the structure of Question Answer system based on SOA, define the structure of the dictionary of Keywords and searching template, the word segmentation algorithm based on the dictionary of keyword, the storage of searching template and the algorithm of template matching. On the foundation, we implement a QA system for Railway domain application, the experimental result show that QA system based on techniques we employed has high accuracy and recognition rate.