Accuracy of computer understanding query of natural language is key to the quality of the natural language interface. Through the study of the Chinese query sentences, which include the imperative sentences and special questions, the yes-or-no questions, the positive and negative questions, choosing questions etc, the relation of composing conception, logical conception and standard conception is studied and built. The conception of the query target is decomposed into three steps, which are direct query target step, logic discursion target step and compare judge target step, the relation of the three steps also has been studied .The query semantic template id and sentence type id recognition and query sentence, above three steps query target recognize arithmetic are constructed, so the base of product the SELECT's clause of SQL's sentence is established.