Electronic Commerce (EC) is changing the relationship between customers and producers in ways more profound than industries, especially the highly information-intensive banking industry, can be yet imagined. And thus makes competitive advantage through the strategies on customer relationship management (CRM). This paper is puzzled out four profitable EC/CRM business strategies, including contact channel management, customer information management, enterprise-wide strategy, and information technology support. Furthermore, some relative activities as keys to success for each strategy are identified from the best practices and events of banking industries. Hopefully, a roadmap of the customer-effective EC strategy for Taiwan’s banking industry is provided.