[Purpose/significance]Previous studies on the main path of citation networks treated all academic literatures and their citation relations alike and ignored the link semantic information.In order to change this practice,this paper designed a method to extract the main path of knowledge flow from the perspective of citation content.[Method/process]Firstly,a method of calculating the mount of knowledge flow from the perspective of citation content is used to calculate the knowledge flow between nodes;Then the types of knowledge flow path between nodes are judged from the emotional tendency of re...