Abstract: An indexing system for Phase diagram of electrolyte based on mulimedia and internet technique was introduced. By using Web technique and dynamic drawing softwares, the system may regenerate many binary ternary and quadrary component phase diagram as well as curves of properties for these systems. The system is consisting of two main functions, one is to redraw 2-D diagrams from literatures, and the second is dynamic showing of three dimensional phase diagram of electrolyte. The system can run on the Internet.