Electronic medical records, in addition contributing to a hospital¡¦s overall electronic development and moving towards a paperless environment, also allow hospitals to share electronic medical information. To solve the problem of different medical information systems that hamper information sharing, the Executive Yuan Heath Department Commission has requested the assistance of the Taiwan Association for Medical Information to establish a standard Electronic Medical Record Template, in hopes that there is a national unified Electronic Medical Record Template that also uses the international medical information standard, so that all hospital¡¦s information is accessible, allowing for easy sharing of electronic medical records. The administration department also supports in recommending and creating related steps of incentive, to encourage professional electronic medical record researchers making up a standard internet medical information exchange mechanism, with a goal of achieving national medical information exchange. Though the Executive Yuan Heath Department Commission had a nice scheme, but the standard Electronic Medical Record Template established by Taiwan Association for Medical Information is nothing more than a Form Structure Diagram what is far from the software architecture discipline. This research aims to re-define the electronic medical record system, adopting a software architecture modeling approach. Through Structure Element Diagram, Structure Element Service Diagram, Structure Behavior Coalescence Diagram, and Sequence Diagram as four gold rules, we are able to build up any electronic medical record system architecture. Besides providing medical information personnel a more definite electronic medical record system, this research aids hospitals quickly attain an effective electronic medical record system.