The development of the real educational contents and customized virtual education systems satisfying the needs of specific engineering education domain is getting more and more research attention in this era of Web and virtual technologies. By analyzing the characteristics of computer-based educational methods and using the rapidly changing Internet and object technologies, we developed a Web-based, interactive virtual laboratory system for unit operations and process systems engineering education. The proposed system is expected to overcome many obstacles in performing the unit operations laboratory at the current setting. More teachwares and experiment suites are being added for the extensive, quantitative evaluation on educational efficiency of the proposed system, and the result will be reported at the conference.