针对传统RTU通讯速率低、通讯规约不统一、系统不开放,分析了在IEC 60870-5-104通信规约的基础上,结合嵌入式Internet技术,设计了一套开放、灵活、可靠的Webit-GRTU体系结构。通过实例验证了设计目标,为传统RTU低成本更新换代开辟了一条途径。Cooperation of different industry supervisor systems seamlessly and transparently through Internet is a main trend in industry control systems. Low communication speed, inconsistent protocol and closed system are the primary reasons hindering the development of traditional RTU. Analyzing embedded Internet technology and IEC 60870-5-104 protocol, we propose a general RTU design framework—Webit-GRTU. Application example validates that the design is an effective way for traditional RTU to upgrade.