In view of the existing circumstances and problems in the medical services of chronic disease health consulting and guidance, an intelligent question-answering (QA) system based on B/S pattern is proposed in this paper. The system adopts a way combining automatic intelligent searching with semi-automatic assistant QA technology. Firstly, a structural model is established, and then the function of each module is discussed. Besides, an improved similarity algorithm is put forward and illustrated to have a good matching effect by experiment analysis.