The present disclosure discloses a method and a device for clarifying questions based on deep question and answer. The method includes: receiving a query sentence; recalling corresponding answer titles and/or history query sentences according to the query sentence; analyzing the answer titles and/or the history query sentences to obtain corresponding dependency trees; clustering the answer titles and/or the history query sentences according to the dependency trees, to generate at least one cluster of questions; generalizing the at least one cluster of questions to generate candidate and clarified questions; and displaying the candidate and clarified questions.