This paper analyses Automatic words extraction and gives a method of extracting words without dictionary. This method avoids the complex grammar and rules, needn’t enormous support from dictionary, and resolves the problems brought by the new words. So we conclude that this method has better exactness and is very pragmatic and powerful in practical operation. This paper analyzes Automatic words extraction and gives a method of liquidating words without dictionary. This method avoids the complex grammar and rules, need not huge support from dictionary, and resolves the problems brought by the new words. So we conclude that this method has has better exactness and is very pragmatic and powerful in practical operation.