A method of an interactive conversation-learning system includes the steps of: selecting at least one conversation topic provided with at least one conversation target and a plurality of conversation sentences; inputting a first conversation sentence into the interactive conversation-learning system; defining at least one conversation route according to the first conversation sentence, and providing a correlation among the conversation target, the conversation sentences and the conversation route to form a relationship model; and outputting a second conversation sentence connecting with the first conversation sentence via the designated conversation route. Accordingly, the interactive conversation-learning system of a preferred embodiment is provided with a plurality of relationship models.