An instant messaging interaction system and method work by: analyzing communicative information sent by a remote user to create emotional messages and analyzing information about the remote user's identity; storage in a storage module behavior weight value preset and corresponding to the information about the remote user's identity; determining, by a learning module, interactive responses according to the emotional messages and the behavior weight values; outputting, by an output module, the interactive responses; detecting if receiving a feedback signal from an local user; if the feedback signal is not received, the learning module stores the behavior weight value in the storage module; if the feedback signal is received, the feedback module generates a modification value corresponding to different levels of the feedback signal; generating, by the learning module and according to a detection result, modification values for modifying the behavior weight values. As a result, the messaging interaction system is capable of presenting rated interactive responses in a personalized, artificial intelligence-based manner that meets the local user's expectation.