The present invention discloses a system and method for service matching of IM software, which is adapted for operating between a plurality of user devices and a plurality of IM software supplier servers. The IM software supplier server provides at least one IM software associated service. The user device merely installs one of the plurality of IM software, and the user device can access services provided by different IM software supplier servers. The service matching method comprises: relaying a service request to the corresponding IM software supplier server according to a correspondence table defining the IM software and names of the IM software associated service when the user device makes the service request; and returning a feedback of the corresponding IM software supplier server to the user device made the service request.