We have developed a prototype HL7(Health Level 7) message browser for web based healthcare networking. Because most of commercial HL7 interface tools have high price, the purpose of this study is to provide a message tool for those who are willing to exchange clinical data in an e fficient and cost-effective manner. The present development is based on HL7 v. 2.3.1 using HTML and JAVA servlet to be implemented on web environment. The preliminary results include 1) input message, 2) parsing and inter pretation via web browse r with HTML and XML, and 3) transf erring message to another site through the socket communication. Although we have found more efficient performance than we expected with numerous encouraging results, error correcting mechanism needs to be improved continuously throughout the on-going project development.