The invention relates to an interaction-based knowledge mapping domain question/answer (Q/A) system retrieval improving method and device, and belongs to the technical field of software. The method comprises the steps that a target problem input by a user is mapped into a BGP map through a Q/A system, and answer information is generated and shown on the basis of the BGP map; a correct answer input by the user for the answer information; an answer map corresponding to the correct answer is determined, wherein the answer map adopts the correct answer as a subject and is composed of a plurality of triple entities related to a preset number of edges expanded to the periphery, and the edges are included in the triple entities; on the basis of various preset modification modes, the BGP map is modified in preset times to obtain a plurality of modified BGP maps; a target modified BGP map matched with the answer map is determined in the multiple modified BGP maps, on the basis of the target modified BGP map, and the triple entities corresponding to phrases included in the target problem in a mapping dictionary are modified, wherein the mapping dictionary is used for storing the corresponding relation between the short phrases and the triple entities.