Remote visualization service is an indispensable part for super computing center and network computing services. We present a web-based remote visualization system architecture - ScVisGrid. It provides a web-based interface for end users to access visualization resources in SCCAS by launching visualization tasks in interactive mode. With component-based visualization framework, the existing standalone software or new functions could be easily and flexibly integrated into remote visualization system, which makes the system convenient, flexible and scalable. Two application examples are also provided to demonstrate the usefulness of the system.