Software architecture is important to software development and it affects the cost and quality of software. Today the diverse Question Answering (QA) system is pervasive, except for simple architectures developed for industry use there is almost no universal software architecture which exists for question answering system, especially for research use. In this paper, we proposed a semantic pattern based user-interactive question answering system and new research-intended software architecture for the question answering system. Here the semantic pattern is used for question and answer analysis to improve the correctness of extracted answers. The architecture of the question answering system is a three dimensional one, with one dimension used for system optimization and experimentation. Through the implementation of the architecture, we can clearly comprehend the principles and software architecture of our QA system.