Web applications in China are growing rapidly in recent years. However many web applications in China require the exlusive use of IE browser. Conformance to W3C standards ensures cross-browser portability of web applications. In this paper, a model-based automatic refactoring method for standardization of web applications is proposed, which employs the characteristics of web applications from the perspective of legacy systems. As an example, a cross-browser access to the original IE-only on-line banking for Bank of China is shown, which demonstrates that the proposed method can handle the existing problems of the standardization of web applications effectively.