The invention discloses a man-
machine interaction question-answering method and 
system based on complex intention intelligent recognition, and the method comprises the steps: obtaining an original question 
sentence of a user, carrying out the 
sentence segmentation and part-of-speech tagging, and obtaining the part-of-speech information of each component word of the question 
sentence; performing dependency 
syntax analysis on the question sentence to obtain a dependency 
syntax tree; carrying out industry entity identification to obtain industry entities and the number, and extracting a core 
dependency tree to simplify questions; carrying out industry question 
relation classification on the questions, carrying out Chinese multi-intention question 
rewriting, and then carrying out 
knowledge retrieval on the questions; and selecting and generating answers for 
knowledge retrieval results, and returning the answers to the user. According to the method and 
system, multi-intention complex questions can be effectively simplified in any industrial scene, the intention of the user can be accurately understood, the industrial knowledge can be more naturally fed back to the user, the user can more accurately and quickly obtain the required industrial knowledge, the user experience is improved, and the method and 
system are particularly suitable for man-
machine interaction intelligent 
questions and answers in the medical industry.